15684991872 has 384 divisors, whose sum is σ = 48946128000. Its totient is φ = 4434186240.

The previous prime is 15684991813. The next prime is 15684991873. The reversal of 15684991872 is 27819948651.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15684991873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96226863 + ... + 96227025.

It is an arithmetic number, because the mean of its divisors is an integer number (127463875).

Almost surely, 2^15684991872 is an apocalyptic number.

15684991872 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 15684991872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24473064000).

15684991872 is an abundant number, since it is smaller than the sum of its proper divisors (33261136128).

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

15684991872 is a wasteful number, since it uses less digits than its factorization.

15684991872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 307 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 60.

The spelling of 15684991872 in words is "fifteen billion, six hundred eighty-four million, nine hundred ninety-one thousand, eight hundred seventy-two".