172993656 has 64 divisors (see below), whose sum is σ = 473932800. Its totient is φ = 52185600.

The previous prime is 172993627. The next prime is 172993739. The reversal of 172993656 is 656399271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62265 + ... + 64983.

It is an arithmetic number, because the mean of its divisors is an integer number (7405200).

Almost surely, 2^172993656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172993656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236966400).

172993656 is an abundant number, since it is smaller than the sum of its proper divisors (300939144).

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

172993656 is a wasteful number, since it uses less digits than its factorization.

172993656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980 (or 2976 counting only the distinct ones).

The product of its digits is 612360, while the sum is 48.

The square root of 172993656 is about 13152.7052730607. The cubic root of 172993656 is about 557.1986544662.

The spelling of 172993656 in words is "one hundred seventy-two million, nine hundred ninety-three thousand, six hundred fifty-six".