172971720 has 64 divisors (see below), whose sum is σ = 576576000. Its totient is φ = 46125504.

The previous prime is 172971697. The next prime is 172971727. The reversal of 172971720 is 27179271.

172971720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (172971727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79000 + ... + 81159.

It is an arithmetic number, because the mean of its divisors is an integer number (9009000).

Almost surely, 2^172971720 is an apocalyptic number.

172971720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172971720 is an abundant number, since it is smaller than the sum of its proper divisors (403604280).

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

172971720 is a wasteful number, since it uses less digits than its factorization.

172971720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160179 (or 160169 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 172971720 is about 13151.8713497357. The cubic root of 172971720 is about 557.1751021067.

The spelling of 172971720 in words is "one hundred seventy-two million, nine hundred seventy-one thousand, seven hundred twenty".