28645562720 has 24 divisors (see below), whose sum is σ = 67675142304. Its totient is φ = 11458225024.

The previous prime is 28645562713. The next prime is 28645562749. The reversal of 28645562720 is 2726554682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89517224 + ... + 89517543.

It is an arithmetic number, because the mean of its divisors is an integer number (2819797596).

Almost surely, 2^28645562720 is an apocalyptic number.

28645562720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28645562720 is an abundant number, since it is smaller than the sum of its proper divisors (39029579584).

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

28645562720 is a wasteful number, since it uses less digits than its factorization.

28645562720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179034782 (or 179034774 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 28645562720 in words is "twenty-eight billion, six hundred forty-five million, five hundred sixty-two thousand, seven hundred twenty".