28338720520 has 128 divisors (see below), whose sum is σ = 75041043840. Its totient is φ = 9515683840.

The previous prime is 28338720497. The next prime is 28338720563. The reversal of 28338720520 is 2502783382.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360699 + ... + 432181.

It is an arithmetic number, because the mean of its divisors is an integer number (586258155).

Almost surely, 2^28338720520 is an apocalyptic number.

28338720520 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 28338720520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37520521920).

28338720520 is an abundant number, since it is smaller than the sum of its proper divisors (46702323320).

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

28338720520 is a wasteful number, since it uses less digits than its factorization.

28338720520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71575 (or 71571 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 28338720520 in words is "twenty-eight billion, three hundred thirty-eight million, seven hundred twenty thousand, five hundred twenty".