27220639 has 4 divisors (see below), whose sum is σ = 27244224. Its totient is φ = 27197056.

The previous prime is 27220607. The next prime is 27220643. The reversal of 27220639 is 93602272.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27220639 - 2⁵ = 27220607 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27220639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27220649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9967 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (6811056).

Almost surely, 2^27220639 is an apocalyptic number.

27220639 is a deficient number, since it is larger than the sum of its proper divisors (23585).

27220639 is a wasteful number, since it uses less digits than its factorization.

27220639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23584.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 27220639 is about 5217.3402227572. The cubic root of 27220639 is about 300.8149655804.

The spelling of 27220639 in words is "twenty-seven million, two hundred twenty thousand, six hundred thirty-nine".