28775918 has 16 divisors (see below), whose sum is σ = 45547920. Its totient is φ = 13597056.

The previous prime is 28775909. The next prime is 28775927. The reversal of 28775918 is 81957782.

It is an interprime number because it is at equal distance from previous prime (28775909) and next prime (28775927).

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, 21896 + ... + 23172.

It is an arithmetic number, because the mean of its divisors is an integer number (2846745).

Almost surely, 2^28775918 is an apocalyptic number.

28775918 is a deficient number, since it is larger than the sum of its proper divisors (16772002).

28775918 is a wasteful number, since it uses less digits than its factorization.

28775918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891.

The product of its digits is 282240, while the sum is 47.

The square root of 28775918 is about 5364.3189688906. The cubic root of 28775918 is about 306.4383127267.

The spelling of 28775918 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred eighteen".