28255800 has 48 divisors (see below), whose sum is σ = 87594840. Its totient is φ = 7534720.

The previous prime is 28255757. The next prime is 28255807. The reversal of 28255800 is 855282.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22947 + ... + 24146.

Almost surely, 2^28255800 is an apocalyptic number.

28255800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28255800 is an abundant number, since it is smaller than the sum of its proper divisors (59339040).

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

28255800 is a wasteful number, since it uses less digits than its factorization.

28255800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47112 (or 47103 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28255800 is about 5315.6184964687. The cubic root of 28255800 is about 304.5808090617.

The spelling of 28255800 in words is "twenty-eight million, two hundred fifty-five thousand, eight hundred".