172723720 has 32 divisors (see below), whose sum is σ = 418524120. Its totient is φ = 63774720.

The previous prime is 172723717. The next prime is 172723751. The reversal of 172723720 is 27327271.

It can be written as a sum of positive squares in 4 ways, for example, as 74753316 + 97970404 = 8646^2 + 9898^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165561 + ... + 166600.

Almost surely, 2^172723720 is an apocalyptic number.

172723720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172723720 is an abundant number, since it is smaller than the sum of its proper divisors (245800400).

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

172723720 is a wasteful number, since it uses less digits than its factorization.

172723720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332185 (or 332181 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 172723720 is about 13142.4396517542. The cubic root of 172723720 is about 556.9086895457.

The spelling of 172723720 in words is "one hundred seventy-two million, seven hundred twenty-three thousand, seven hundred twenty".