28028420641620 has 144 divisors (see below), whose sum is σ = 97600910883840. Its totient is φ = 6377767400448.

The previous prime is 28028420641601. The next prime is 28028420641673. The reversal of 28028420641620 is 2614602482082.

28028420641620 is a `hidden beast` number, since 2 + 8 + 0 + 2 + 8 + 4 + 206 + 416 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 49595205 + ... + 50157164.

It is an arithmetic number, because the mean of its divisors is an integer number (677784103360).

Almost surely, 2^{28028420641620} is an apocalyptic number.

28028420641620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28028420641620 is an abundant number, since it is smaller than the sum of its proper divisors (69572490242220).

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

28028420641620 is a wasteful number, since it uses less digits than its factorization.

28028420641620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99752614 (or 99752609 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 28028420641620 in words is "twenty-eight trillion, twenty-eight billion, four hundred twenty million, six hundred forty-one thousand, six hundred twenty".