71307728164 has 6 divisors (see below), whose sum is σ = 124788524294. Its totient is φ = 35653864080.

The previous prime is 71307728153. The next prime is 71307728171. The reversal of 71307728164 is 46182770317.

It can be written as a sum of positive squares in only one way, i.e., 67413968164 + 3893760000 = 259642^2 + 62400^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8913466017 + ... + 8913466024.

Almost surely, 2^71307728164 is an apocalyptic number.

It is an amenable number.

71307728164 is a deficient number, since it is larger than the sum of its proper divisors (53480796130).

71307728164 is a wasteful number, since it uses less digits than its factorization.

71307728164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17826932045 (or 17826932043 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 71307728164 in words is "seventy-one billion, three hundred seven million, seven hundred twenty-eight thousand, one hundred sixty-four".