172308902220 has 288 divisors, whose sum is σ = 652892018688. Its totient is φ = 35812440576.

The previous prime is 172308902219. The next prime is 172308902251. The reversal of 172308902220 is 22209803271.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1018957 + ... + 1175963.

It is an arithmetic number, because the mean of its divisors is an integer number (2266986176).

Almost surely, 2^172308902220 is an apocalyptic number.

172308902220 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 172308902220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326446009344).

172308902220 is an abundant number, since it is smaller than the sum of its proper divisors (480583116468).

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

172308902220 is a wasteful number, since it uses less digits than its factorization.

172308902220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157109 (or 157104 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 172308902220 in words is "one hundred seventy-two billion, three hundred eight million, nine hundred two thousand, two hundred twenty".