28111253220 has 72 divisors (see below), whose sum is σ = 88021489920. Its totient is φ = 7254515520.

The previous prime is 28111253213. The next prime is 28111253263. The reversal of 28111253220 is 2235211182.

28111253220 is a `hidden beast` number, since 281 + 112 + 53 + 220 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2513350 + ... + 2524509.

Almost surely, 2^28111253220 is an apocalyptic number.

28111253220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28111253220 is an abundant number, since it is smaller than the sum of its proper divisors (59910236700).

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

28111253220 is a wasteful number, since it uses less digits than its factorization.

28111253220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037905 (or 5037900 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 28111253220 in words is "twenty-eight billion, one hundred eleven million, two hundred fifty-three thousand, two hundred twenty".