172394987904 has 320 divisors, whose sum is σ = 546170526000. Its totient is φ = 53823356928.

The previous prime is 172394987903. The next prime is 172394987927. The reversal of 172394987904 is 409789493271.

172394987904 is a `hidden beast` number, since 1 + 72 + 3 + 9 + 498 + 79 + 0 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172394987903) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17527372 + ... + 17537204.

Almost surely, 2^172394987904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172394987904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273085263000).

172394987904 is an abundant number, since it is smaller than the sum of its proper divisors (373775538096).

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

172394987904 is an equidigital number, since it uses as much as digits as its factorization.

172394987904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9967 (or 9946 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 172394987904 in words is "one hundred seventy-two billion, three hundred ninety-four million, nine hundred eighty-seven thousand, nine hundred four".