28810868 has 6 divisors (see below), whose sum is σ = 50419026. Its totient is φ = 14405432.

The previous prime is 28810867. The next prime is 28810879. The reversal of 28810868 is 86801882.

It can be written as a sum of positive squares in only one way, i.e., 28601104 + 209764 = 5348^2 + 458^2 .

It is a super-2 number, since 2×28810868² = 1660132229826848, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3601355 + ... + 3601362.

It is an arithmetic number, because the mean of its divisors is an integer number (8403171).

Almost surely, 2^28810868 is an apocalyptic number.

It is an amenable number.

28810868 is a deficient number, since it is larger than the sum of its proper divisors (21608158).

28810868 is a wasteful number, since it uses less digits than its factorization.

28810868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202721 (or 7202719 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 28810868 is about 5367.5756166076. The cubic root of 28810868 is about 306.5623248257.

The spelling of 28810868 in words is "twenty-eight million, eight hundred ten thousand, eight hundred sixty-eight".