71687408904 has 24 divisors (see below), whose sum is σ = 194153399310. Its totient is φ = 23895802944.

The previous prime is 71687408887. The next prime is 71687408927. The reversal of 71687408904 is 40980478617.

It is a happy number.

71687408904 is a `hidden beast` number, since 71 + 6 + 87 + 408 + 90 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71023316004 + 664092900 = 266502^2 + 25770^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 497829157 + ... + 497829300.

Almost surely, 2^71687408904 is an apocalyptic number.

It is an amenable number.

71687408904 is an abundant number, since it is smaller than the sum of its proper divisors (122465990406).

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

71687408904 is a wasteful number, since it uses less digits than its factorization.

71687408904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995658469 (or 995658462 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 71687408904 in words is "seventy-one billion, six hundred eighty-seven million, four hundred eight thousand, nine hundred four".