51572007440 has 40 divisors (see below), whose sum is σ = 122829435288. Its totient is φ = 20125660160.

The previous prime is 51572007437. The next prime is 51572007451. The reversal of 51572007440 is 4470027515.

It can be written as a sum of positive squares in 4 ways, for example, as 157351936 + 51414655504 = 12544^2 + 226748^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 51572007440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7858307 + ... + 7864866.

Almost surely, 2^51572007440 is an apocalyptic number.

It is an amenable number.

51572007440 is an abundant number, since it is smaller than the sum of its proper divisors (71257427848).

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

51572007440 is a wasteful number, since it uses less digits than its factorization.

51572007440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15723227 (or 15723221 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 35.

The spelling of 51572007440 in words is "fifty-one billion, five hundred seventy-two million, seven thousand, four hundred forty".