78912260172 has 72 divisors (see below), whose sum is σ = 200830812000. Its totient is φ = 26125590528.

The previous prime is 78912260137. The next prime is 78912260183. The reversal of 78912260172 is 27106221987.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3216729 + ... + 3241167.

Almost surely, 2^78912260172 is an apocalyptic number.

It is an amenable number.

78912260172 is an abundant number, since it is smaller than the sum of its proper divisors (121918551828).

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

78912260172 is a wasteful number, since it uses less digits than its factorization.

78912260172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25055 (or 25050 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 78912260172 in words is "seventy-eight billion, nine hundred twelve million, two hundred sixty thousand, one hundred seventy-two".