28002204220820 has 24 divisors (see below), whose sum is σ = 58973123517000. Its totient is φ = 11168787468672.

The previous prime is 28002204220747. The next prime is 28002204220889. The reversal of 28002204220820 is 2802240220082.

It can be written as a sum of positive squares in 4 ways, for example, as 690647426704 + 27311556794116 = 831052^2 + 5226046^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005881575 + ... + 2005895534.

It is an arithmetic number, because the mean of its divisors is an integer number (2457213479875).

Almost surely, 2^{28002204220820} is an apocalyptic number.

28002204220820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28002204220820 is an abundant number, since it is smaller than the sum of its proper divisors (30970919296180).

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

28002204220820 is a wasteful number, since it uses less digits than its factorization.

28002204220820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011777467 (or 4011777465 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The spelling of 28002204220820 in words is "twenty-eight trillion, two billion, two hundred four million, two hundred twenty thousand, eight hundred twenty".