172296720 has 120 divisors (see below), whose sum is σ = 600128256. Its totient is φ = 45940608.

The previous prime is 172296701. The next prime is 172296721. The reversal of 172296720 is 27692271.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (172296721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15009 + ... + 23871.

Almost surely, 2^172296720 is an apocalyptic number.

172296720 is a gapful number since it is divisible by the number (10) 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 172296720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300064128).

172296720 is an abundant number, since it is smaller than the sum of its proper divisors (427831536).

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

172296720 is an equidigital number, since it uses as much as digits as its factorization.

172296720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891 (or 8873 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 172296720 is about 13126.1845179778. The cubic root of 172296720 is about 556.4493891100.

The spelling of 172296720 in words is "one hundred seventy-two million, two hundred ninety-six thousand, seven hundred twenty".