51440512 has 64 divisors (see below), whose sum is σ = 108617760. Its totient is φ = 24217600.

The previous prime is 51440449. The next prime is 51440531. The reversal of 51440512 is 21504415.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×51440512² = 5292252549644288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297258 + ... + 297430.

Almost surely, 2^51440512 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 51440512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54308880).

51440512 is an abundant number, since it is smaller than the sum of its proper divisors (57177248).

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

51440512 is a wasteful number, since it uses less digits than its factorization.

51440512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51440512 is about 7172.2041242564. The cubic root of 51440512 is about 371.9076349864.

Adding to 51440512 its reverse (21504415), we get a palindrome (72944927).

The spelling of 51440512 in words is "fifty-one million, four hundred forty thousand, five hundred twelve".