172890530 has 16 divisors (see below), whose sum is σ = 318441024. Its totient is φ = 67547760.

The previous prime is 172890457. The next prime is 172890539. The reversal of 172890530 is 35098271.

It is a super-2 number, since 2×172890530² = 59782270727361800, which contains 22 as substring.

It is a Curzon 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, 200606 + ... + 201465.

It is an arithmetic number, because the mean of its divisors is an integer number (19902564).

Almost surely, 2^172890530 is an apocalyptic number.

172890530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172890530 is a deficient number, since it is larger than the sum of its proper divisors (145550494).

172890530 is a wasteful number, since it uses less digits than its factorization.

172890530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402121.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 172890530 is about 13148.7843544565. The cubic root of 172890530 is about 557.0879122736.

The spelling of 172890530 in words is "one hundred seventy-two million, eight hundred ninety thousand, five hundred thirty".