172115712 has 144 divisors (see below), whose sum is σ = 523509280. Its totient is φ = 55738368.

The previous prime is 172115707. The next prime is 172115731. The reversal of 172115712 is 217511271.

172115712 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255408 + ... + 256080.

Almost surely, 2^172115712 is an apocalyptic number.

172115712 is a gapful number since it is divisible by the number (12) 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 172115712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261754640).

172115712 is an abundant number, since it is smaller than the sum of its proper divisors (351393568).

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

172115712 is an equidigital number, since it uses as much as digits as its factorization.

172115712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 715 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 172115712 is about 13119.2877855469. The cubic root of 172115712 is about 556.2544597210.

Adding to 172115712 its reverse (217511271), we get a palindrome (389626983).

The spelling of 172115712 in words is "one hundred seventy-two million, one hundred fifteen thousand, seven hundred twelve".