28810866 has 16 divisors (see below), whose sum is σ = 65853504. Its totient is φ = 8231664.

The previous prime is 28810841. The next prime is 28810867. The reversal of 28810866 is 66801882.

It is not an unprimeable number, because it can be changed into a prime (28810867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342945 + ... + 343028.

It is an arithmetic number, because the mean of its divisors is an integer number (4115844).

Almost surely, 2^28810866 is an apocalyptic number.

28810866 is an abundant number, since it is smaller than the sum of its proper divisors (37042638).

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

28810866 is a wasteful number, since it uses less digits than its factorization.

28810866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685985.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28810866 is about 5367.5754303037. The cubic root of 28810866 is about 306.5623177320.

The spelling of 28810866 in words is "twenty-eight million, eight hundred ten thousand, eight hundred sixty-six".