51364644 has 24 divisors (see below), whose sum is σ = 123717888. Its totient is φ = 16569120.

The previous prime is 51364639. The next prime is 51364739. The reversal of 51364644 is 44646315.

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, 68667 + ... + 69410.

It is an arithmetic number, because the mean of its divisors is an integer number (5154912).

Almost surely, 2^51364644 is an apocalyptic number.

It is an amenable number.

51364644 is an abundant number, since it is smaller than the sum of its proper divisors (72353244).

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

51364644 is a wasteful number, since it uses less digits than its factorization.

51364644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138115 (or 138113 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 51364644 is about 7166.9131430484. The cubic root of 51364644 is about 371.7247067177.

The spelling of 51364644 in words is "fifty-one million, three hundred sixty-four thousand, six hundred forty-four".