172571136 has 80 divisors (see below), whose sum is σ = 462526944. Its totient is φ = 57176064.

The previous prime is 172571123. The next prime is 172571137. The reversal of 172571136 is 631175271.

It is a junction number, because it is equal to n+sod(n) for n = 172571097 and 172571106.

It is not an unprimeable number, because it can be changed into a prime (172571137) 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, 434490 + ... + 434886.

Almost surely, 2^172571136 is an apocalyptic number.

172571136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172571136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231263472).

172571136 is an abundant number, since it is smaller than the sum of its proper divisors (289955808).

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

172571136 is an equidigital number, since it uses as much as digits as its factorization.

172571136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 685 counting only the distinct ones).

The product of its digits is 8820, while the sum is 33.

The square root of 172571136 is about 13136.6333586654. The cubic root of 172571136 is about 556.7446503311.

The spelling of 172571136 in words is "one hundred seventy-two million, five hundred seventy-one thousand, one hundred thirty-six".