28125618 has 16 divisors (see below), whose sum is σ = 58066176. Its totient is φ = 9072720.

The previous prime is 28125611. The next prime is 28125623. The reversal of 28125618 is 81652182.

It is not an unprimeable number, because it can be changed into a prime (28125611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75421 + ... + 75792.

It is an arithmetic number, because the mean of its divisors is an integer number (3629136).

Almost surely, 2^28125618 is an apocalyptic number.

28125618 is an abundant number, since it is smaller than the sum of its proper divisors (29940558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28125618 is a wasteful number, since it uses less digits than its factorization.

28125618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151249.

The product of its digits is 7680, while the sum is 33.

The square root of 28125618 is about 5303.3591241778. The cubic root of 28125618 is about 304.1123271999.

The spelling of 28125618 in words is "twenty-eight million, one hundred twenty-five thousand, six hundred eighteen".