28551591936 has 384 divisors, whose sum is σ = 102368448000. Its totient is φ = 7675969536.

The previous prime is 28551591899. The next prime is 28551591947. The reversal of 28551591936 is 63919515582.

28551591936 is a `hidden beast` number, since 2 + 8 + 5 + 515 + 91 + 9 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 6578055 + ... + 6582393.

It is an arithmetic number, because the mean of its divisors is an integer number (266584500).

Almost surely, 2^28551591936 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 28551591936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51184224000).

28551591936 is an abundant number, since it is smaller than the sum of its proper divisors (73816856064).

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

28551591936 is a wasteful number, since it uses less digits than its factorization.

28551591936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394 (or 4368 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 28551591936 in words is "twenty-eight billion, five hundred fifty-one million, five hundred ninety-one thousand, nine hundred thirty-six".