28553933688 has 128 divisors (see below), whose sum is σ = 83496960000. Its totient is φ = 7967585664.

The previous prime is 28553933677. The next prime is 28553933689. The reversal of 28553933688 is 88633935582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28553933689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3936481 + ... + 3943727.

It is an arithmetic number, because the mean of its divisors is an integer number (652320000).

Almost surely, 2^28553933688 is an apocalyptic number.

28553933688 is a gapful number since it is divisible by the number (28) 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 28553933688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41748480000).

28553933688 is an abundant number, since it is smaller than the sum of its proper divisors (54943026312).

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

28553933688 is a wasteful number, since it uses less digits than its factorization.

28553933688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7809 (or 7805 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 60.

The spelling of 28553933688 in words is "twenty-eight billion, five hundred fifty-three million, nine hundred thirty-three thousand, six hundred eighty-eight".