51519864 has 96 divisors (see below), whose sum is σ = 143735760. Its totient is φ = 15375360.

The previous prime is 51519857. The next prime is 51519883. The reversal of 51519864 is 46891515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328074 + ... + 328230.

Almost surely, 2^51519864 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 51519864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71867880).

51519864 is an abundant number, since it is smaller than the sum of its proper divisors (92215896).

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

51519864 is a wasteful number, since it uses less digits than its factorization.

51519864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 286 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 51519864 is about 7177.7339042347. The cubic root of 51519864 is about 372.0987713213.

It can be divided in two parts, 51 and 519864, that added together give a palindrome (519915).

The spelling of 51519864 in words is "fifty-one million, five hundred nineteen thousand, eight hundred sixty-four".