28987222 has 16 divisors (see below), whose sum is σ = 49496832. Its totient is φ = 12602920.

The previous prime is 28987207. The next prime is 28987253. The reversal of 28987222 is 22278982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28138 + ... + 29149.

It is an arithmetic number, because the mean of its divisors is an integer number (3093552).

Almost surely, 2^28987222 is an apocalyptic number.

28987222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28987222 is a deficient number, since it is larger than the sum of its proper divisors (20509610).

28987222 is a wasteful number, since it uses less digits than its factorization.

28987222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57323.

The product of its digits is 64512, while the sum is 40.

The square root of 28987222 is about 5383.9782689012. The cubic root of 28987222 is about 307.1865517275.

The spelling of 28987222 in words is "twenty-eight million, nine hundred eighty-seven thousand, two hundred twenty-two".