51644928 has 40 divisors (see below), whose sum is σ = 137589408. Its totient is φ = 17214464.

The previous prime is 51644927. The next prime is 51644947. The reversal of 51644928 is 82944615.

It is not an unprimeable number, because it can be changed into a prime (51644927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15276 + ... + 18347.

Almost surely, 2^51644928 is an apocalyptic number.

It is an amenable number.

51644928 is an abundant number, since it is smaller than the sum of its proper divisors (85944480).

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

51644928 is an equidigital number, since it uses as much as digits as its factorization.

51644928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33644 (or 33628 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 51644928 is about 7186.4405653981. The cubic root of 51644928 is about 372.3996168105.

The spelling of 51644928 in words is "fifty-one million, six hundred forty-four thousand, nine hundred twenty-eight".