15578998128 has 120 divisors (see below), whose sum is σ = 45172689120. Its totient is φ = 5006184960.

The previous prime is 15578998117. The next prime is 15578998163. The reversal of 15578998128 is 82189987551.

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, 3100258 + ... + 3105278.

It is an arithmetic number, because the mean of its divisors is an integer number (376439076).

Almost surely, 2^15578998128 is an apocalyptic number.

15578998128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15578998128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22586344560).

15578998128 is an abundant number, since it is smaller than the sum of its proper divisors (29593690992).

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

15578998128 is a wasteful number, since it uses less digits than its factorization.

15578998128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807 (or 5798 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 63.

The spelling of 15578998128 in words is "fifteen billion, five hundred seventy-eight million, nine hundred ninety-eight thousand, one hundred twenty-eight".