28665700 has 72 divisors (see below), whose sum is σ = 73439744. Its totient is φ = 9504000.

The previous prime is 28665697. The next prime is 28665701. The reversal of 28665700 is 756682.

It is not an unprimeable number, because it can be changed into a prime (28665701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21040 + ... + 22360.

Almost surely, 2^28665700 is an apocalyptic number.

28665700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28665700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36719872).

28665700 is an abundant number, since it is smaller than the sum of its proper divisors (44774044).

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

28665700 is a wasteful number, since it uses less digits than its factorization.

28665700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 28665700 is about 5354.0358609184. The cubic root of 28665700 is about 306.0465704392.

The spelling of 28665700 in words is "twenty-eight million, six hundred sixty-five thousand, seven hundred".