28475655780 has 96 divisors (see below), whose sum is σ = 93670996608. Its totient is φ = 6372172800.

The previous prime is 28475655763. The next prime is 28475655797. The reversal of 28475655780 is 8755657482.

It is an interprime number because it is at equal distance from previous prime (28475655763) and next prime (28475655797).

It is a self number, because there is not a number n which added to its sum of digits gives 28475655780.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1650841 + ... + 1668000.

It is an arithmetic number, because the mean of its divisors is an integer number (975739548).

Almost surely, 2^28475655780 is an apocalyptic number.

28475655780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28475655780 is an abundant number, since it is smaller than the sum of its proper divisors (65195340828).

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

28475655780 is a wasteful number, since it uses less digits than its factorization.

28475655780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318877 (or 3318875 counting only the distinct ones).

The product of its (nonzero) digits is 18816000, while the sum is 57.

The spelling of 28475655780 in words is "twenty-eight billion, four hundred seventy-five million, six hundred fifty-five thousand, seven hundred eighty".