51571404 has 72 divisors (see below), whose sum is σ = 143187408. Its totient is φ = 16174080.

The previous prime is 51571397. The next prime is 51571409. The reversal of 51571404 is 40417515.

It is a happy number.

51571404 is a `hidden beast` number, since 51 + 571 + 40 + 4 = 666.

51571404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51571409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14964 + ... + 18084.

It is an arithmetic number, because the mean of its divisors is an integer number (1988714).

Almost surely, 2^51571404 is an apocalyptic number.

51571404 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51571404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71593704).

51571404 is an abundant number, since it is smaller than the sum of its proper divisors (91616004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51571404 is a wasteful number, since it uses less digits than its factorization.

51571404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157 (or 3143 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 51571404 is about 7181.3232763886. The cubic root of 51571404 is about 372.2228113684. Note that the first 3 decimals are identical.

Adding to 51571404 its reverse (40417515), we get a palindrome (91988919).

It can be divided in two parts, 5157 and 1404, that added together give a 8-th power (6561 = 3⁸).

The spelling of 51571404 in words is "fifty-one million, five hundred seventy-one thousand, four hundred four".