28713938556 has 72 divisors (see below), whose sum is σ = 70969296720. Its totient is φ = 9034447104.

The previous prime is 28713938527. The next prime is 28713938557. The reversal of 28713938556 is 65583931782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 28713938496 and 28713938505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28713938557) 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, 1188000 + ... + 1211928.

Almost surely, 2^28713938556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28713938556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35484648360).

28713938556 is an abundant number, since it is smaller than the sum of its proper divisors (42255358164).

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

28713938556 is a wasteful number, since it uses less digits than its factorization.

28713938556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24251 (or 24230 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 57.

The spelling of 28713938556 in words is "twenty-eight billion, seven hundred thirteen million, nine hundred thirty-eight thousand, five hundred fifty-six".