28990618 has 16 divisors (see below), whose sum is σ = 45882720. Its totient is φ = 13700016.

The previous prime is 28990607. The next prime is 28990639. The reversal of 28990618 is 81609982.

It is a happy 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, 25396 + ... + 26512.

It is an arithmetic number, because the mean of its divisors is an integer number (2867670).

Almost surely, 2^28990618 is an apocalyptic number.

28990618 is a deficient number, since it is larger than the sum of its proper divisors (16892102).

28990618 is a wasteful number, since it uses less digits than its factorization.

28990618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28990618 is about 5384.2936398380. The cubic root of 28990618 is about 307.1985474129.

The spelling of 28990618 in words is "twenty-eight million, nine hundred ninety thousand, six hundred eighteen".