172890529 has 8 divisors (see below), whose sum is σ = 202929728. Its totient is φ = 144186480.

The previous prime is 172890457. The next prime is 172890539. The reversal of 172890529 is 925098271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172890529 - 2¹⁵ = 172857761 is a prime.

It is a super-2 number, since 2×172890529² = 59782270035799682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172890539) 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, 333507 + ... + 334024.

It is an arithmetic number, because the mean of its divisors is an integer number (25366216).

Almost surely, 2^172890529 is an apocalyptic number.

It is an amenable number.

172890529 is a deficient number, since it is larger than the sum of its proper divisors (30039199).

172890529 is an equidigital number, since it uses as much as digits as its factorization.

172890529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667575.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 172890529 is about 13148.7843164302. The cubic root of 172890529 is about 557.0879111995.

The spelling of 172890529 in words is "one hundred seventy-two million, eight hundred ninety thousand, five hundred twenty-nine".