28910591220 has 192 divisors, whose sum is σ = 93807415296. Its totient is φ = 6516357120.

The previous prime is 28910591207. The next prime is 28910591243. The reversal of 28910591220 is 2219501982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10012617 + ... + 10015503.

It is an arithmetic number, because the mean of its divisors is an integer number (488580288).

Almost surely, 2^28910591220 is an apocalyptic number.

28910591220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28910591220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46903707648).

28910591220 is an abundant number, since it is smaller than the sum of its proper divisors (64896824076).

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

28910591220 is a wasteful number, since it uses less digits than its factorization.

28910591220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230 (or 3228 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 28910591220 in words is "twenty-eight billion, nine hundred ten million, five hundred ninety-one thousand, two hundred twenty".