78888172 has 12 divisors (see below), whose sum is σ = 150604776. Its totient is φ = 35858240.

The previous prime is 78888169. The next prime is 78888191. The reversal of 78888172 is 27188887.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896413 + ... + 896500.

It is an arithmetic number, because the mean of its divisors is an integer number (12550398).

Almost surely, 2^78888172 is an apocalyptic number.

It is an amenable number.

78888172 is a deficient number, since it is larger than the sum of its proper divisors (71716604).

78888172 is a wasteful number, since it uses less digits than its factorization.

78888172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792928 (or 1792926 counting only the distinct ones).

The product of its digits is 401408, while the sum is 49.

The square root of 78888172 is about 8881.9013730169. The cubic root of 78888172 is about 428.8814846050.

The spelling of 78888172 in words is "seventy-eight million, eight hundred eighty-eight thousand, one hundred seventy-two".