172028688 has 80 divisors (see below), whose sum is σ = 491593536. Its totient is φ = 51494400.

The previous prime is 172028683. The next prime is 172028699. The reversal of 172028688 is 886820271.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (172028683) 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, 19363 + ... + 26813.

Almost surely, 2^172028688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172028688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245796768).

172028688 is an abundant number, since it is smaller than the sum of its proper divisors (319564848).

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

172028688 is a wasteful number, since it uses less digits than its factorization.

172028688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7512 (or 7506 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 172028688 is about 13115.9707227487. The cubic root of 172028688 is about 556.1606940244.

The spelling of 172028688 in words is "one hundred seventy-two million, twenty-eight thousand, six hundred eighty-eight".