172400660 has 24 divisors (see below), whose sum is σ = 362491080. Its totient is φ = 68874624.

The previous prime is 172400659. The next prime is 172400671. The reversal of 172400660 is 66004271.

It can be written as a sum of positive squares in 4 ways, for example, as 80317444 + 92083216 = 8962^2 + 9596^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12626 + ... + 22454.

It is an arithmetic number, because the mean of its divisors is an integer number (15103795).

Almost surely, 2^172400660 is an apocalyptic number.

172400660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172400660 is an abundant number, since it is smaller than the sum of its proper divisors (190090420).

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

172400660 is a wasteful number, since it uses less digits than its factorization.

172400660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715 (or 10713 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 172400660 is about 13130.1431827684. The cubic root of 172400660 is about 556.5612614719.

The spelling of 172400660 in words is "one hundred seventy-two million, four hundred thousand, six hundred sixty".