172130660 has 96 divisors (see below), whose sum is σ = 414257760. Its totient is φ = 59609088.

The previous prime is 172130641. The next prime is 172130681. The reversal of 172130660 is 66031271.

It can be written as a sum of positive squares in 16 ways, for example, as 75933796 + 96196864 = 8714^2 + 9808^2 .

It is a super-2 number, since 2×172130660² = 59257928224071200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278672 + ... + 279288.

It is an arithmetic number, because the mean of its divisors is an integer number (4315185).

Almost surely, 2^172130660 is an apocalyptic number.

172130660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172130660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207128880).

172130660 is an abundant number, since it is smaller than the sum of its proper divisors (242127100).

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

172130660 is a wasteful number, since it uses less digits than its factorization.

172130660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 172130660 is about 13119.8574687380. The cubic root of 172130660 is about 556.2705625526.

The spelling of 172130660 in words is "one hundred seventy-two million, one hundred thirty thousand, six hundred sixty".