86978172 has 24 divisors (see below), whose sum is σ = 204127056. Its totient is φ = 28824448.

The previous prime is 86978167. The next prime is 86978173. The reversal of 86978172 is 27187968.

It is a super-3 number, since 3×86978172³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86978173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18873 + ... + 23024.

It is an arithmetic number, because the mean of its divisors is an integer number (8505294).

Almost surely, 2^86978172 is an apocalyptic number.

It is an amenable number.

86978172 is an abundant number, since it is smaller than the sum of its proper divisors (117148884).

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

86978172 is a wasteful number, since it uses less digits than its factorization.

86978172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42077 (or 42075 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 86978172 is about 9326.2088760653. The cubic root of 86978172 is about 443.0677012507.

The spelling of 86978172 in words is "eighty-six million, nine hundred seventy-eight thousand, one hundred seventy-two".