15879290778 has 48 divisors (see below), whose sum is σ = 37318313760. Its totient is φ = 4850775072.

The previous prime is 15879290773. The next prime is 15879290807. The reversal of 15879290778 is 87709297851.

It is a super-2 number, since 2×15879290778² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15879290773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211576 + ... + 276627.

It is an arithmetic number, because the mean of its divisors is an integer number (777464870).

Almost surely, 2^15879290778 is an apocalyptic number.

15879290778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15879290778 is an abundant number, since it is smaller than the sum of its proper divisors (21439022982).

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

15879290778 is a wasteful number, since it uses less digits than its factorization.

15879290778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488363 (or 488360 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 63.

The spelling of 15879290778 in words is "fifteen billion, eight hundred seventy-nine million, two hundred ninety thousand, seven hundred seventy-eight".