172899780 has 48 divisors (see below), whose sum is σ = 493262784. Its totient is φ = 45235840.

The previous prime is 172899761. The next prime is 172899787. The reversal of 172899780 is 87998271.

172899780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172899787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24006 + ... + 30365.

It is an arithmetic number, because the mean of its divisors is an integer number (10276308).

Almost surely, 2^172899780 is an apocalyptic number.

172899780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172899780 is an abundant number, since it is smaller than the sum of its proper divisors (320363004).

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

172899780 is a wasteful number, since it uses less digits than its factorization.

172899780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54436 (or 54434 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 172899780 is about 13149.1360932953. The cubic root of 172899780 is about 557.0978472139.

The spelling of 172899780 in words is "one hundred seventy-two million, eight hundred ninety-nine thousand, seven hundred eighty".