78982172 has 12 divisors (see below), whose sum is σ = 142677696. Its totient is φ = 38217120.

The previous prime is 78982159. The next prime is 78982177. The reversal of 78982172 is 27128987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78982177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318353 + ... + 318600.

It is an arithmetic number, because the mean of its divisors is an integer number (11889808).

Almost surely, 2^78982172 is an apocalyptic number.

It is an amenable number.

78982172 is a deficient number, since it is larger than the sum of its proper divisors (63695524).

78982172 is a wasteful number, since it uses less digits than its factorization.

78982172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636988 (or 636986 counting only the distinct ones).

The product of its digits is 112896, while the sum is 44.

The square root of 78982172 is about 8887.1914573728. The cubic root of 78982172 is about 429.0517630156.

The spelling of 78982172 in words is "seventy-eight million, nine hundred eighty-two thousand, one hundred seventy-two".