15109378920 has 96 divisors (see below), whose sum is σ = 50689566720. Its totient is φ = 3899191680.

The previous prime is 15109378901. The next prime is 15109378931. The reversal of 15109378920 is 2987390151.

15109378920 is a `hidden beast` number, since 1 + 510 + 9 + 37 + 89 + 20 = 666.

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

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, 665784 + ... + 688103.

It is an arithmetic number, because the mean of its divisors is an integer number (528016320).

Almost surely, 2^15109378920 is an apocalyptic number.

15109378920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15109378920 is an abundant number, since it is smaller than the sum of its proper divisors (35580187800).

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

15109378920 is a wasteful number, since it uses less digits than its factorization.

15109378920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353935 (or 1353928 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 15109378920 in words is "fifteen billion, one hundred nine million, three hundred seventy-eight thousand, nine hundred twenty".