172977990 has 16 divisors (see below), whose sum is σ = 415147248. Its totient is φ = 46127456.

The previous prime is 172977989. The next prime is 172978007. The reversal of 172977990 is 99779271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2882937 + ... + 2882996.

It is an arithmetic number, because the mean of its divisors is an integer number (25946703).

Almost surely, 2^172977990 is an apocalyptic number.

172977990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172977990 is an abundant number, since it is smaller than the sum of its proper divisors (242169258).

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

172977990 is a wasteful number, since it uses less digits than its factorization.

172977990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765943.

The product of its (nonzero) digits is 500094, while the sum is 51.

The square root of 172977990 is about 13152.1097166956. The cubic root of 172977990 is about 557.1818343164.

The spelling of 172977990 in words is "one hundred seventy-two million, nine hundred seventy-seven thousand, nine hundred ninety".