172523028 has 24 divisors (see below), whose sum is σ = 402814720. Its totient is φ = 57470400.

The previous prime is 172523011. The next prime is 172523033. The reversal of 172523028 is 820325271.

It is a junction number, because it is equal to n+sod(n) for n = 172522986 and 172523004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19728 + ... + 27096.

Almost surely, 2^172523028 is an apocalyptic number.

It is an amenable number.

172523028 is an abundant number, since it is smaller than the sum of its proper divisors (230291692).

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

172523028 is a wasteful number, since it uses less digits than its factorization.

172523028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327 (or 9325 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 172523028 is about 13134.8021682856. The cubic root of 172523028 is about 556.6929105838.

Adding to 172523028 its reverse (820325271), we get a palindrome (992848299).

It can be divided in two parts, 1725 and 23028, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 172523028 in words is "one hundred seventy-two million, five hundred twenty-three thousand, twenty-eight".