15379998978 has 32 divisors (see below), whose sum is σ = 31052756160. Its totient is φ = 5078097920.

The previous prime is 15379998971. The next prime is 15379998979. The reversal of 15379998978 is 87989997351.

It is not an unprimeable number, because it can be changed into a prime (15379998971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248158 + ... + 303878.

It is an arithmetic number, because the mean of its divisors is an integer number (970398630).

Almost surely, 2^15379998978 is an apocalyptic number.

15379998978 is an abundant number, since it is smaller than the sum of its proper divisors (15672757182).

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

15379998978 is a wasteful number, since it uses less digits than its factorization.

15379998978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56162.

The product of its digits is 308629440, while the sum is 75.

The spelling of 15379998978 in words is "fifteen billion, three hundred seventy-nine million, nine hundred ninety-eight thousand, nine hundred seventy-eight".