15947612820 has 72 divisors (see below), whose sum is σ = 48385952160. Its totient is φ = 4251683520.

The previous prime is 15947612819. The next prime is 15947612839. The reversal of 15947612820 is 2821674951.

15947612820 is a `hidden beast` number, since 1 + 5 + 9 + 4 + 7 + 612 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1032555 + ... + 1047885.

Almost surely, 2^15947612820 is an apocalyptic number.

15947612820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15947612820 is an abundant number, since it is smaller than the sum of its proper divisors (32438339340).

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

15947612820 is a wasteful number, since it uses less digits than its factorization.

15947612820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21125 (or 21120 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 15947612820 in words is "fifteen billion, nine hundred forty-seven million, six hundred twelve thousand, eight hundred twenty".