172318820000 has 60 divisors (see below), whose sum is σ = 423930194226. Its totient is φ = 68927520000.

The previous prime is 172318819997. The next prime is 172318820071. The reversal of 172318820000 is 28813271.

It can be written as a sum of positive squares in 5 ways, for example, as 163532944 + 172155287056 = 12788^2 + 414916^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4287971 + ... + 4327970.

Almost surely, 2^172318820000 is an apocalyptic number.

172318820000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172318820000 is an abundant number, since it is smaller than the sum of its proper divisors (251611374226).

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

172318820000 is an frugal number, since it uses more digits than its factorization.

172318820000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8615971 (or 8615948 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The spelling of 172318820000 in words is "one hundred seventy-two billion, three hundred eighteen million, eight hundred twenty thousand".