27728618 has 8 divisors (see below), whose sum is σ = 41961348. Its totient is φ = 13741504.

The previous prime is 27728599. The next prime is 27728621. The reversal of 27728618 is 81682772.

It can be written as a sum of positive squares in 2 ways, for example, as 16752649 + 10975969 = 4093^2 + 3313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61121 + ... + 61572.

Almost surely, 2^27728618 is an apocalyptic number.

27728618 is a deficient number, since it is larger than the sum of its proper divisors (14232730).

27728618 is a wasteful number, since it uses less digits than its factorization.

27728618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122808.

The product of its digits is 75264, while the sum is 41.

The square root of 27728618 is about 5265.7969957073. The cubic root of 27728618 is about 302.6746681521.

The spelling of 27728618 in words is "twenty-seven million, seven hundred twenty-eight thousand, six hundred eighteen".