15964687872 has 480 divisors, whose sum is σ = 57053348352. Its totient is φ = 4357545984.

The previous prime is 15964687853. The next prime is 15964687883. The reversal of 15964687872 is 27878646951.

15964687872 is a `hidden beast` number, since 1 + 5 + 96 + 468 + 7 + 87 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20030578 + ... + 20031374.

Almost surely, 2^15964687872 is an apocalyptic number.

15964687872 is a gapful number since it is divisible by the number (12) 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 15964687872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28526674176).

15964687872 is an abundant number, since it is smaller than the sum of its proper divisors (41088660480).

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

15964687872 is an frugal number, since it uses more digits than its factorization.

15964687872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 832 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 15964687872 in words is "fifteen billion, nine hundred sixty-four million, six hundred eighty-seven thousand, eight hundred seventy-two".