172428705 has 48 divisors (see below), whose sum is σ = 333141120. Its totient is φ = 81990144.

The previous prime is 172428679. The next prime is 172428713. The reversal of 172428705 is 507824271.

It is not a de Polignac number, because 172428705 - 2¹⁰ = 172427681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172428705.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8604 + ... + 20466.

It is an arithmetic number, because the mean of its divisors is an integer number (6940440).

Almost surely, 2^172428705 is an apocalyptic number.

172428705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172428705 is a deficient number, since it is larger than the sum of its proper divisors (160712415).

172428705 is a wasteful number, since it uses less digits than its factorization.

172428705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11910 (or 11907 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 172428705 is about 13131.2111017986. The cubic root of 172428705 is about 556.5914390715.

The spelling of 172428705 in words is "one hundred seventy-two million, four hundred twenty-eight thousand, seven hundred five".