28667618 has 16 divisors (see below), whose sum is σ = 51731520. Its totient is φ = 11639376.

The previous prime is 28667609. The next prime is 28667623. The reversal of 28667618 is 81676682.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 53621 + ... + 54152.

It is an arithmetic number, because the mean of its divisors is an integer number (3233220).

Almost surely, 2^28667618 is an apocalyptic number.

28667618 is a deficient number, since it is larger than the sum of its proper divisors (23063902).

28667618 is a wasteful number, since it uses less digits than its factorization.

28667618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107801.

The product of its digits is 193536, while the sum is 44.

The square root of 28667618 is about 5354.2149751387. The cubic root of 28667618 is about 306.0533960674.

The spelling of 28667618 in words is "twenty-eight million, six hundred sixty-seven thousand, six hundred eighteen".