172890375 has 72 divisors (see below), whose sum is σ = 338144976. Its totient is φ = 78220800.

The previous prime is 172890371. The next prime is 172890383. The reversal of 172890375 is 573098271.

It is not a de Polignac number, because 172890375 - 2² = 172890371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172890371) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1782327 + ... + 1782423.

It is an arithmetic number, because the mean of its divisors is an integer number (4696458).

Almost surely, 2^172890375 is an apocalyptic number.

172890375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172890375 is a deficient number, since it is larger than the sum of its proper divisors (165254601).

172890375 is an frugal number, since it uses more digits than its factorization.

172890375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 172890375 is about 13148.7784603742. The cubic root of 172890375 is about 557.0877457932.

Multiplying 172890375 by its product of nonzero digits (105840), we get a square (18298717290000 = 4277700²).

The spelling of 172890375 in words is "one hundred seventy-two million, eight hundred ninety thousand, three hundred seventy-five".