28390560 has 192 divisors, whose sum is σ = 103057920. Its totient is φ = 6497280.

The previous prime is 28390543. The next prime is 28390589. The reversal of 28390560 is 6509382.

It is a happy number.

It is a super-2 number, since 2×28390560² = 1612047794227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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, 100179 + ... + 100461.

It is an arithmetic number, because the mean of its divisors is an integer number (536760).

Almost surely, 2^28390560 is an apocalyptic number.

28390560 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 28390560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51528960).

28390560 is an abundant number, since it is smaller than the sum of its proper divisors (74667360).

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

28390560 is a wasteful number, since it uses less digits than its factorization.

28390560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 28390560 is about 5328.2792719601. The cubic root of 28390560 is about 305.0642523418.

The spelling of 28390560 in words is "twenty-eight million, three hundred ninety thousand, five hundred sixty".