172571978320 has 80 divisors (see below), whose sum is σ = 463275848448. Its totient is φ = 58557542400.

The previous prime is 172571978291. The next prime is 172571978321. The reversal of 172571978320 is 23879175271.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172571978321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1534156 + ... + 1642795.

Almost surely, 2^172571978320 is an apocalyptic number.

172571978320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172571978320 is an abundant number, since it is smaller than the sum of its proper divisors (290703870128).

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

172571978320 is a wasteful number, since it uses less digits than its factorization.

172571978320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177068 (or 3177062 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 172571978320 in words is "one hundred seventy-two billion, five hundred seventy-one million, nine hundred seventy-eight thousand, three hundred twenty".