172351728 has 60 divisors (see below), whose sum is σ = 483638688. Its totient is φ = 57296640.

The previous prime is 172351721. The next prime is 172351757. The reversal of 172351728 is 827153271.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 172351692 and 172351701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172351721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60676 + ... + 63452.

Almost surely, 2^172351728 is an apocalyptic number.

172351728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

172351728 is an abundant number, since it is smaller than the sum of its proper divisors (311286960).

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

172351728 is a wasteful number, since it uses less digits than its factorization.

172351728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222 (or 3213 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 172351728 is about 13128.2797045157. The cubic root of 172351728 is about 556.5086007442.

The spelling of 172351728 in words is "one hundred seventy-two million, three hundred fifty-one thousand, seven hundred twenty-eight".