15725708640 has 144 divisors (see below), whose sum is σ = 53986147488. Its totient is φ = 4168347648.

The previous prime is 15725708639. The next prime is 15725708651. The reversal of 15725708640 is 4680752751.

15725708640 is a `hidden beast` number, since 1 + 5 + 72 + 570 + 8 + 6 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207784 + ... + 273176.

It is an arithmetic number, because the mean of its divisors is an integer number (374903802).

Almost surely, 2^15725708640 is an apocalyptic number.

15725708640 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 15725708640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26993073744).

15725708640 is an abundant number, since it is smaller than the sum of its proper divisors (38260438848).

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

15725708640 is a wasteful number, since it uses less digits than its factorization.

15725708640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65581 (or 65570 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 15725708640 in words is "fifteen billion, seven hundred twenty-five million, seven hundred eight thousand, six hundred forty".