28515598513920 has 2592 divisors, whose sum is σ = 126314338550400. Its totient is φ = 5901776584704.

The previous prime is 28515598513907. The next prime is 28515598513931. The reversal of 28515598513920 is 2931589551582.

It is a happy number.

28515598513920 is a `hidden beast` number, since 2 + 8 + 5 + 1 + 5 + 5 + 98 + 513 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 19954931766 + ... + 19954933194.

It is an arithmetic number, because the mean of its divisors is an integer number (48732383700).

Almost surely, 2^{28515598513920} is an apocalyptic number.

28515598513920 is a gapful number since it is divisible by the number (20) 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 28515598513920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63157169275200).

28515598513920 is an abundant number, since it is smaller than the sum of its proper divisors (97798740036480).

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

28515598513920 is a wasteful number, since it uses less digits than its factorization.

28515598513920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 38880000, while the sum is 63.

The spelling of 28515598513920 in words is "twenty-eight trillion, five hundred fifteen billion, five hundred ninety-eight million, five hundred thirteen thousand, nine hundred twenty".