15857428320 has 240 divisors, whose sum is σ = 56256642288. Its totient is φ = 4206504960.

The previous prime is 15857428319. The next prime is 15857428343. The reversal of 15857428320 is 2382475851.

15857428320 is a `hidden beast` number, since 1 + 58 + 574 + 2 + 8 + 3 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 39 ways as a sum of consecutive naturals, for example, 2550015 + ... + 2556225.

Almost surely, 2^15857428320 is an apocalyptic number.

15857428320 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 15857428320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28128321144).

15857428320 is an abundant number, since it is smaller than the sum of its proper divisors (40399213968).

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

15857428320 is a wasteful number, since it uses less digits than its factorization.

15857428320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6418 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 15857428320 in words is "fifteen billion, eight hundred fifty-seven million, four hundred twenty-eight thousand, three hundred twenty".