51644960 has 24 divisors (see below), whose sum is σ = 122011596. Its totient is φ = 20657920.

The previous prime is 51644947. The next prime is 51644987. The reversal of 51644960 is 6944615.

It can be written as a sum of positive squares in 2 ways, for example, as 47499664 + 4145296 = 6892^2 + 2036^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51644960.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161231 + ... + 161550.

Almost surely, 2^51644960 is an apocalyptic number.

It is an amenable number.

51644960 is an abundant number, since it is smaller than the sum of its proper divisors (70366636).

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

51644960 is a wasteful number, since it uses less digits than its factorization.

51644960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322796 (or 322788 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 51644960 is about 7186.4427918129. The cubic root of 51644960 is about 372.3996937254.

The spelling of 51644960 in words is "fifty-one million, six hundred forty-four thousand, nine hundred sixty".