172660720 has 20 divisors (see below), whose sum is σ = 401436360. Its totient is φ = 69064256.

The previous prime is 172660703. The next prime is 172660739. The reversal of 172660720 is 27066271.

172660720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079050 + ... + 1079209.

It is an arithmetic number, because the mean of its divisors is an integer number (20071818).

Almost surely, 2^172660720 is an apocalyptic number.

172660720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172660720 is an abundant number, since it is smaller than the sum of its proper divisors (228775640).

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

172660720 is a wasteful number, since it uses less digits than its factorization.

172660720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158272 (or 2158266 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 172660720 is about 13140.0426178913. The cubic root of 172660720 is about 556.8409715469.

The spelling of 172660720 in words is "one hundred seventy-two million, six hundred sixty thousand, seven hundred twenty".