15978904290 has 64 divisors (see below), whose sum is σ = 43210609920. Its totient is φ = 4201021440.

The previous prime is 15978904261. The next prime is 15978904309. The reversal of 15978904290 is 9240987951.

15978904290 is a `hidden beast` number, since 1 + 597 + 8 + 9 + 0 + 42 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 397599 + ... + 435938.

It is an arithmetic number, because the mean of its divisors is an integer number (675165780).

Almost surely, 2^15978904290 is an apocalyptic number.

15978904290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15978904290 is an abundant number, since it is smaller than the sum of its proper divisors (27231705630).

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

15978904290 is a wasteful number, since it uses less digits than its factorization.

15978904290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833624 (or 833618 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 15978904290 in words is "fifteen billion, nine hundred seventy-eight million, nine hundred four thousand, two hundred ninety".