28290018 has 16 divisors (see below), whose sum is σ = 56658816. Its totient is φ = 9416880.

The previous prime is 28290007. The next prime is 28290019. The reversal of 28290018 is 81009282.

It is not an unprimeable number, because it can be changed into a prime (28290019) 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, 2055 + ... + 7797.

It is an arithmetic number, because the mean of its divisors is an integer number (3541176).

Almost surely, 2^28290018 is an apocalyptic number.

28290018 is an abundant number, since it is smaller than the sum of its proper divisors (28368798).

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

28290018 is a wasteful number, since it uses less digits than its factorization.

28290018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6569.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28290018 is about 5318.8361508887. The cubic root of 28290018 is about 304.7037093967.

The spelling of 28290018 in words is "twenty-eight million, two hundred ninety thousand, eighteen".