28813918 has 32 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 11604384.

The previous prime is 28813909. The next prime is 28813919. The reversal of 28813918 is 81931882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39271 + ... + 39997.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^28813918 is an apocalyptic number.

28813918 is a deficient number, since it is larger than the sum of its proper divisors (23602082).

28813918 is a wasteful number, since it uses less digits than its factorization.

28813918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904.

The product of its digits is 27648, while the sum is 40.

The square root of 28813918 is about 5367.8597224592. The cubic root of 28813918 is about 306.5731422957.

The spelling of 28813918 in words is "twenty-eight million, eight hundred thirteen thousand, nine hundred eighteen".