172488978 has 24 divisors (see below), whose sum is σ = 380062800. Its totient is φ = 56521464.

The previous prime is 172488971. The next prime is 172489003. The reversal of 172488978 is 879884271.

It is a happy number.

172488978 is a `hidden beast` number, since 1 + 72 + 488 + 97 + 8 = 666.

172488978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172488971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80148 + ... + 82271.

It is an arithmetic number, because the mean of its divisors is an integer number (15835950).

Almost surely, 2^172488978 is an apocalyptic number.

172488978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172488978 is an abundant number, since it is smaller than the sum of its proper divisors (207573822).

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

172488978 is a wasteful number, since it uses less digits than its factorization.

172488978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162486 (or 162483 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 172488978 is about 13133.5059294919. The cubic root of 172488978 is about 556.6562842833.

The spelling of 172488978 in words is "one hundred seventy-two million, four hundred eighty-eight thousand, nine hundred seventy-eight".