51545560 has 64 divisors (see below), whose sum is σ = 130636800. Its totient is φ = 18134400.

The previous prime is 51545531. The next prime is 51545561. The reversal of 51545560 is 6554515.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11751 + ... + 15529.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^51545560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51545560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65318400).

51545560 is an abundant number, since it is smaller than the sum of its proper divisors (79091240).

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

51545560 is a wasteful number, since it uses less digits than its factorization.

51545560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832 (or 3828 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 51545560 is about 7179.5236610795. The cubic root of 51545560 is about 372.1606235864.

It can be divided in two parts, 515455 and 60, that added together give a palindrome (515515).

The spelling of 51545560 in words is "fifty-one million, five hundred forty-five thousand, five hundred sixty".