28888918 has 4 divisors (see below), whose sum is σ = 43333380. Its totient is φ = 14444458.

The previous prime is 28888903. The next prime is 28888939. The reversal of 28888918 is 81988882.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7222228 + ... + 7222231.

It is an arithmetic number, because the mean of its divisors is an integer number (10833345).

Almost surely, 2^28888918 is an apocalyptic number.

28888918 is a deficient number, since it is larger than the sum of its proper divisors (14444462).

28888918 is a wasteful number, since it uses less digits than its factorization.

28888918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14444461.

The product of its digits is 589824, while the sum is 52.

The square root of 28888918 is about 5374.8412069567. The cubic root of 28888918 is about 306.8389058169.

The spelling of 28888918 in words is "twenty-eight million, eight hundred eighty-eight thousand, nine hundred eighteen".