172888730 has 32 divisors (see below), whose sum is σ = 359665920. Its totient is φ = 58608000.

The previous prime is 172888717. The next prime is 172888739. The reversal of 172888730 is 37888271.

It is a super-2 number, since 2×172888730² = 59781025922025800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172888739) 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, 7646 + ... + 20105.

It is an arithmetic number, because the mean of its divisors is an integer number (11239560).

Almost surely, 2^172888730 is an apocalyptic number.

172888730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172888730 is an abundant number, since it is smaller than the sum of its proper divisors (186777190).

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

172888730 is a wasteful number, since it uses less digits than its factorization.

172888730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27854.

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 172888730 is about 13148.7159068861. The cubic root of 172888730 is about 557.0859789467.

The spelling of 172888730 in words is "one hundred seventy-two million, eight hundred eighty-eight thousand, seven hundred thirty".