64251439272 has 32 divisors (see below), whose sum is σ = 178476220800. Its totient is φ = 21417146352.

The previous prime is 64251439247. The next prime is 64251439303. The reversal of 64251439272 is 27293415246.

64251439272 is a `hidden beast` number, since 6 + 4 + 251 + 4 + 392 + 7 + 2 = 666.

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, 148729968 + ... + 148730399.

It is an arithmetic number, because the mean of its divisors is an integer number (5577381900).

Almost surely, 2^64251439272 is an apocalyptic number.

It is an amenable number.

64251439272 is an abundant number, since it is smaller than the sum of its proper divisors (114224781528).

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

64251439272 is a wasteful number, since it uses less digits than its factorization.

64251439272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297460382 (or 297460372 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 64251439272 in words is "sixty-four billion, two hundred fifty-one million, four hundred thirty-nine thousand, two hundred seventy-two".