28665800 has 24 divisors (see below), whose sum is σ = 66648450. Its totient is φ = 11466240.

The previous prime is 28665781. The next prime is 28665809. The reversal of 28665800 is 856682.

It can be written as a sum of positive squares in 3 ways, for example, as 26481316 + 2184484 = 5146^2 + 1478^2 .

It is not an unprimeable number, because it can be changed into a prime (28665809) 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, 71465 + ... + 71864.

Almost surely, 2^28665800 is an apocalyptic number.

28665800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28665800 is an abundant number, since it is smaller than the sum of its proper divisors (37982650).

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

28665800 is a wasteful number, since it uses less digits than its factorization.

28665800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143345 (or 143336 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 28665800 is about 5354.0451996598. The cubic root of 28665800 is about 306.0469263189.

The spelling of 28665800 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred".