172317380 has 24 divisors (see below), whose sum is σ = 377600832. Its totient is φ = 65929952.

The previous prime is 172317377. The next prime is 172317427. The reversal of 172317380 is 83713271.

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, 186842 + ... + 187761.

It is an arithmetic number, because the mean of its divisors is an integer number (15733368).

Almost surely, 2^172317380 is an apocalyptic number.

172317380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172317380 is an abundant number, since it is smaller than the sum of its proper divisors (205283452).

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

172317380 is a wasteful number, since it uses less digits than its factorization.

172317380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374635 (or 374633 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 172317380 is about 13126.9714709829. The cubic root of 172317380 is about 556.4716293958.

The spelling of 172317380 in words is "one hundred seventy-two million, three hundred seventeen thousand, three hundred eighty".