15604172640 has 384 divisors, whose sum is σ = 63178859520. Its totient is φ = 3523129344.

The previous prime is 15604172621. The next prime is 15604172699. The reversal of 15604172640 is 4627140651.

15604172640 is a `hidden beast` number, since 1 + 5 + 6 + 0 + 4 + 1 + 7 + 2 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 15604172595 and 15604172604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2506812 + ... + 2513028.

It is an arithmetic number, because the mean of its divisors is an integer number (164528280).

Almost surely, 2^15604172640 is an apocalyptic number.

15604172640 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 15604172640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31589429760).

15604172640 is an abundant number, since it is smaller than the sum of its proper divisors (47574686880).

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

15604172640 is a wasteful number, since it uses less digits than its factorization.

15604172640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6331 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 15604172640 in words is "fifteen billion, six hundred four million, one hundred seventy-two thousand, six hundred forty".