15994812072 has 32 divisors (see below), whose sum is σ = 40068499680. Its totient is φ = 5320741440.

The previous prime is 15994812037. The next prime is 15994812077. The reversal of 15994812072 is 27021849951.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (15994812077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666883 + ... + 690450.

It is an arithmetic number, because the mean of its divisors is an integer number (1252140615).

Almost surely, 2^15994812072 is an apocalyptic number.

15994812072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15994812072 is an abundant number, since it is smaller than the sum of its proper divisors (24073687608).

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

15994812072 is a wasteful number, since it uses less digits than its factorization.

15994812072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357833 (or 1357829 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 15994812072 in words is "fifteen billion, nine hundred ninety-four million, eight hundred twelve thousand, seventy-two".