172705680 has 120 divisors (see below), whose sum is σ = 662880192. Its totient is φ = 39474432.

The previous prime is 172705667. The next prime is 172705711. The reversal of 172705680 is 86507271.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12094 + ... + 22173.

Almost surely, 2^172705680 is an apocalyptic number.

172705680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172705680 is an abundant number, since it is smaller than the sum of its proper divisors (490174512).

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

172705680 is a wasteful number, since it uses less digits than its factorization.

172705680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34293 (or 34284 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 172705680 is about 13141.7533076831. The cubic root of 172705680 is about 556.8893002332.

The spelling of 172705680 in words is "one hundred seventy-two million, seven hundred five thousand, six hundred eighty".