172344978640 has 160 divisors (see below), whose sum is σ = 439896130560. Its totient is φ = 62512128000.

The previous prime is 172344978607. The next prime is 172344978649. The reversal of 172344978640 is 46879443271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172344978649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9645715 + ... + 9663565.

It is an arithmetic number, because the mean of its divisors is an integer number (2749350816).

Almost surely, 2^172344978640 is an apocalyptic number.

172344978640 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 172344978640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219948065280).

172344978640 is an abundant number, since it is smaller than the sum of its proper divisors (267551151920).

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

172344978640 is a wasteful number, since it uses less digits than its factorization.

172344978640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18141 (or 18135 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 172344978640 in words is "one hundred seventy-two billion, three hundred forty-four million, nine hundred seventy-eight thousand, six hundred forty".