51861408 has 48 divisors (see below), whose sum is σ = 136515456. Its totient is φ = 17239040.

The previous prime is 51861391. The next prime is 51861409. The reversal of 51861408 is 80416815.

51861408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51861409) 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 7 ways as a sum of consecutive naturals, for example, 56473 + ... + 57383.

It is an arithmetic number, because the mean of its divisors is an integer number (2844072).

Almost surely, 2^51861408 is an apocalyptic number.

It is an amenable number.

51861408 is an abundant number, since it is smaller than the sum of its proper divisors (84654048).

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

51861408 is a wasteful number, since it uses less digits than its factorization.

51861408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 51861408 is about 7201.4865132138. The cubic root of 51861408 is about 372.9192205284.

The spelling of 51861408 in words is "fifty-one million, eight hundred sixty-one thousand, four hundred eight".