28218808 has 16 divisors (see below), whose sum is σ = 53656560. Its totient is φ = 13910400.

The previous prime is 28218791. The next prime is 28218809. The reversal of 28218808 is 80881282.

It is a super-2 number, since 2×28218808² = 1592602249881728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24273 + ... + 25408.

It is an arithmetic number, because the mean of its divisors is an integer number (3353535).

Almost surely, 2^28218808 is an apocalyptic number.

It is an amenable number.

28218808 is a deficient number, since it is larger than the sum of its proper divisors (25437752).

28218808 is a wasteful number, since it uses less digits than its factorization.

28218808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49758 (or 49754 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 28218808 is about 5312.1377994175. The cubic root of 28218808 is about 304.4478337228.

The spelling of 28218808 in words is "twenty-eight million, two hundred eighteen thousand, eight hundred eight".