15987004992 has 560 divisors, whose sum is σ = 56993129600. Its totient is φ = 4444263936.

The previous prime is 15987004967. The next prime is 15987004993. The reversal of 15987004992 is 29940078951.

15987004992 is a `hidden beast` number, since 1 + 598 + 7 + 0 + 0 + 49 + 9 + 2 = 666.

It is a super-2 number, since 2×15987004992² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15987004993) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 432081198 + ... + 432081234.

Almost surely, 2^15987004992 is an apocalyptic number.

15987004992 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 15987004992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28496564800).

15987004992 is an abundant number, since it is smaller than the sum of its proper divisors (41006124608).

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

15987004992 is an frugal number, since it uses more digits than its factorization.

15987004992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 15987004992 in words is "fifteen billion, nine hundred eighty-seven million, four thousand, nine hundred ninety-two".