28502800 has 30 divisors (see below), whose sum is σ = 68478938. Its totient is φ = 11400960.

The previous prime is 28502791. The next prime is 28502809. The reversal of 28502800 is 820582.

It is an interprime number because it is at equal distance from previous prime (28502791) and next prime (28502809).

It can be written as a sum of positive squares in 3 ways, for example, as 4999696 + 23503104 = 2236^2 + 4848^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (28502809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35229 + ... + 36028.

Almost surely, 2^28502800 is an apocalyptic number.

28502800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28502800 is an abundant number, since it is smaller than the sum of its proper divisors (39976138).

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

28502800 is a wasteful number, since it uses less digits than its factorization.

28502800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71275 (or 71264 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28502800 is about 5338.8013636021. The cubic root of 28502800 is about 305.4657401157.

The spelling of 28502800 in words is "twenty-eight million, five hundred two thousand, eight hundred".