15867834972 has 72 divisors (see below), whose sum is σ = 40732933248. Its totient is φ = 4804171680.

The previous prime is 15867834959. The next prime is 15867834991. The reversal of 15867834972 is 27943876851.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1887763 + ... + 1896149.

It is an arithmetic number, because the mean of its divisors is an integer number (565735184).

Almost surely, 2^15867834972 is an apocalyptic number.

15867834972 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 15867834972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20366466624).

15867834972 is an abundant number, since it is smaller than the sum of its proper divisors (24865098276).

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

15867834972 is a wasteful number, since it uses less digits than its factorization.

15867834972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9719 (or 9706 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 60.

The spelling of 15867834972 in words is "fifteen billion, eight hundred sixty-seven million, eight hundred thirty-four thousand, nine hundred seventy-two".