28656817632 has 240 divisors, whose sum is σ = 88312637952. Its totient is φ = 9104451840.

The previous prime is 28656817619. The next prime is 28656817711. The reversal of 28656817632 is 23671865682.

28656817632 is a `hidden beast` number, since 2 + 8 + 6 + 568 + 1 + 76 + 3 + 2 = 666.

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 39 ways as a sum of consecutive naturals, for example, 5380923 + ... + 5386245.

Almost surely, 2^28656817632 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 28656817632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44156318976).

28656817632 is an abundant number, since it is smaller than the sum of its proper divisors (59655820320).

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

28656817632 is a wasteful number, since it uses less digits than its factorization.

28656817632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443 (or 5426 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 28656817632 in words is "twenty-eight billion, six hundred fifty-six million, eight hundred seventeen thousand, six hundred thirty-two".