51321264 has 20 divisors (see below), whose sum is σ = 132580056. Its totient is φ = 17107072.

The previous prime is 51321253. The next prime is 51321287. The reversal of 51321264 is 46212315.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534549 + ... + 534644.

Almost surely, 2^51321264 is an apocalyptic number.

It is an amenable number.

51321264 is an abundant number, since it is smaller than the sum of its proper divisors (81258792).

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

51321264 is a wasteful number, since it uses less digits than its factorization.

51321264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069204 (or 1069198 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 51321264 is about 7163.8860962469. The cubic root of 51321264 is about 371.6200305680.

Adding to 51321264 its reverse (46212315), we get a palindrome (97533579).

The spelling of 51321264 in words is "fifty-one million, three hundred twenty-one thousand, two hundred sixty-four".