28568280 has 64 divisors (see below), whose sum is σ = 92302560. Its totient is φ = 7031808.

The previous prime is 28568263. The next prime is 28568303. The reversal of 28568280 is 8286582.

It is a super-2 number, since 2×28568280² = 1632293244316800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7597 + ... + 10716.

Almost surely, 2^28568280 is an apocalyptic number.

28568280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28568280 is an abundant number, since it is smaller than the sum of its proper divisors (63734280).

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

28568280 is a wasteful number, since it uses less digits than its factorization.

28568280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18340 (or 18336 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 28568280 is about 5344.9303082454. The cubic root of 28568280 is about 305.6994785470.

The spelling of 28568280 in words is "twenty-eight million, five hundred sixty-eight thousand, two hundred eighty".