28481800 has 48 divisors (see below), whose sum is σ = 70123860. Its totient is φ = 10721280.

The previous prime is 28481759. The next prime is 28481801. The reversal of 28481800 is 818482.

It can be written as a sum of positive squares in 6 ways, for example, as 8892324 + 19589476 = 2982^2 + 4426^2 .

It is a super-2 number, since 2×28481800² = 1622425862480000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28481801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789 + ... + 7588.

Almost surely, 2^28481800 is an apocalyptic number.

28481800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28481800 is an abundant number, since it is smaller than the sum of its proper divisors (41642060).

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

28481800 is a wasteful number, since it uses less digits than its factorization.

28481800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410 (or 8401 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28481800 is about 5336.8342676160. The cubic root of 28481800 is about 305.3907023815.

The spelling of 28481800 in words is "twenty-eight million, four hundred eighty-one thousand, eight hundred".