87128521344 has 64 divisors (see below), whose sum is σ = 257150160000. Its totient is φ = 29042839296.

The previous prime is 87128521339. The next prime is 87128521387. The reversal of 87128521344 is 44312582178.

87128521344 is a `hidden beast` number, since 8 + 7 + 1 + 285 + 21 + 344 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 87128521344.

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, 12601944 + ... + 12608855.

It is an arithmetic number, because the mean of its divisors is an integer number (4017971250).

Almost surely, 2^87128521344 is an apocalyptic number.

It is an amenable number.

87128521344 is an abundant number, since it is smaller than the sum of its proper divisors (170021638656).

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

87128521344 is a wasteful number, since it uses less digits than its factorization.

87128521344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25210822 (or 25210804 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The spelling of 87128521344 in words is "eighty-seven billion, one hundred twenty-eight million, five hundred twenty-one thousand, three hundred forty-four".