28507800 has 48 divisors (see below), whose sum is σ = 88376040. Its totient is φ = 7601920.

The previous prime is 28507789. The next prime is 28507811. The reversal of 28507800 is 870582.

It is an interprime number because it is at equal distance from previous prime (28507789) and next prime (28507811).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23157 + ... + 24356.

Almost surely, 2^28507800 is an apocalyptic number.

28507800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28507800 is an abundant number, since it is smaller than the sum of its proper divisors (59868240).

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

28507800 is a wasteful number, since it uses less digits than its factorization.

28507800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47532 (or 47523 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 28507800 is about 5339.2696129714. The cubic root of 28507800 is about 305.4836008101.

The spelling of 28507800 in words is "twenty-eight million, five hundred seven thousand, eight hundred".