78657088172 has 24 divisors (see below), whose sum is σ = 148246978656. Its totient is φ = 36301160448.

The previous prime is 78657088109. The next prime is 78657088183. The reversal of 78657088172 is 27188075687.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1186988 + ... + 1251500.

It is an arithmetic number, because the mean of its divisors is an integer number (6176957444).

Almost surely, 2^78657088172 is an apocalyptic number.

It is an amenable number.

78657088172 is a deficient number, since it is larger than the sum of its proper divisors (69589890484).

78657088172 is a wasteful number, since it uses less digits than its factorization.

78657088172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87977 (or 87975 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 59.

The spelling of 78657088172 in words is "seventy-eight billion, six hundred fifty-seven million, eighty-eight thousand, one hundred seventy-two".