172880840 has 32 divisors (see below), whose sum is σ = 424344960. Its totient is φ = 62865600.

The previous prime is 172880821. The next prime is 172880849. The reversal of 172880840 is 48088271.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 172880794 and 172880803.

It is not an unprimeable number, because it can be changed into a prime (172880849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196016 + ... + 196895.

It is an arithmetic number, because the mean of its divisors is an integer number (13260780).

Almost surely, 2^172880840 is an apocalyptic number.

172880840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172880840 is an abundant number, since it is smaller than the sum of its proper divisors (251464120).

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

172880840 is a wasteful number, since it uses less digits than its factorization.

172880840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392933 (or 392929 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 172880840 is about 13148.4158741652. The cubic root of 172880840 is about 557.0775043722.

The spelling of 172880840 in words is "one hundred seventy-two million, eight hundred eighty thousand, eight hundred forty".