51523864 has 64 divisors (see below), whose sum is σ = 116582400. Its totient is φ = 20870784.

The previous prime is 51523861. The next prime is 51523873. The reversal of 51523864 is 46832515.

It is a super-2 number, since 2×51523864² = 5309417122980992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51523861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140209 + ... + 140575.

It is an arithmetic number, because the mean of its divisors is an integer number (1821600).

Almost surely, 2^51523864 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 51523864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58291200).

51523864 is an abundant number, since it is smaller than the sum of its proper divisors (65058536).

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

51523864 is a wasteful number, since it uses less digits than its factorization.

51523864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 508 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 51523864 is about 7178.0125383006. The cubic root of 51523864 is about 372.1084009829.

The spelling of 51523864 in words is "fifty-one million, five hundred twenty-three thousand, eight hundred sixty-four".