172655680 has 56 divisors (see below), whose sum is σ = 412257240. Its totient is φ = 68874240.

The previous prime is 172655663. The next prime is 172655701. The reversal of 172655680 is 86556271.

It can be written as a sum of positive squares in 4 ways, for example, as 10653696 + 162001984 = 3264^2 + 12728^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 226500 + ... + 227260.

Almost surely, 2^172655680 is an apocalyptic number.

172655680 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 172655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206128620).

172655680 is an abundant number, since it is smaller than the sum of its proper divisors (239601560).

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

172655680 is an equidigital number, since it uses as much as digits as its factorization.

172655680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 172655680 is about 13139.8508362919. The cubic root of 172655680 is about 556.8355533954.

The spelling of 172655680 in words is "one hundred seventy-two million, six hundred fifty-five thousand, six hundred eighty".