15993976320 has 720 divisors, whose sum is σ = 66659269248. Its totient is φ = 3530096640.

The previous prime is 15993976283. The next prime is 15993976321. The reversal of 15993976320 is 2367939951.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (720).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15993976321) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 34997532 + ... + 34997988.

Almost surely, 2^15993976320 is an apocalyptic number.

15993976320 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 15993976320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33329634624).

15993976320 is an abundant number, since it is smaller than the sum of its proper divisors (50665292928).

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

15993976320 is a wasteful number, since it uses less digits than its factorization.

15993976320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The spelling of 15993976320 in words is "fifteen billion, nine hundred ninety-three million, nine hundred seventy-six thousand, three hundred twenty".