28647604020 has 144 divisors (see below), whose sum is σ = 93399324480. Its totient is φ = 6541710336.

The previous prime is 28647604001. The next prime is 28647604031. The reversal of 28647604020 is 2040674682.

It is a self number, because there is not a number n which added to its sum of digits gives 28647604020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3485676 + ... + 3493884.

It is an arithmetic number, because the mean of its divisors is an integer number (648606420).

Almost surely, 2^28647604020 is an apocalyptic number.

28647604020 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 28647604020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46699662240).

28647604020 is an abundant number, since it is smaller than the sum of its proper divisors (64751720460).

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

28647604020 is a wasteful number, since it uses less digits than its factorization.

28647604020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422 (or 9413 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The spelling of 28647604020 in words is "twenty-eight billion, six hundred forty-seven million, six hundred four thousand, twenty".