28294608220 has 24 divisors (see below), whose sum is σ = 59446649808. Its totient is φ = 11312515200.

The previous prime is 28294608179. The next prime is 28294608289. The reversal of 28294608220 is 2280649282.

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, 289321 + ... + 374560.

It is an arithmetic number, because the mean of its divisors is an integer number (2476943742).

Almost surely, 2^28294608220 is an apocalyptic number.

28294608220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28294608220 is an abundant number, since it is smaller than the sum of its proper divisors (31152041588).

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

28294608220 is a wasteful number, since it uses less digits than its factorization.

28294608220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666021 (or 666019 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 28294608220 in words is "twenty-eight billion, two hundred ninety-four million, six hundred eight thousand, two hundred twenty".