172197216 has 72 divisors (see below), whose sum is σ = 518505624. Its totient is φ = 54021120.

The previous prime is 172197203. The next prime is 172197239. The reversal of 172197216 is 612791271.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12690 + ... + 22481.

It is an arithmetic number, because the mean of its divisors is an integer number (7201467).

Almost surely, 2^172197216 is an apocalyptic number.

172197216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172197216 is an abundant number, since it is smaller than the sum of its proper divisors (346308408).

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

172197216 is a wasteful number, since it uses less digits than its factorization.

172197216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35204 (or 35193 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 172197216 is about 13122.3936840807. The cubic root of 172197216 is about 556.3422491283.

The spelling of 172197216 in words is "one hundred seventy-two million, one hundred ninety-seven thousand, two hundred sixteen".