27720079 has 4 divisors (see below), whose sum is σ = 28364776. Its totient is φ = 27075384.

The previous prime is 27720053. The next prime is 27720089. The reversal of 27720079 is 97002772.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27720079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27720089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322284 + ... + 322369.

It is an arithmetic number, because the mean of its divisors is an integer number (7091194).

Almost surely, 2^27720079 is an apocalyptic number.

27720079 is a deficient number, since it is larger than the sum of its proper divisors (644697).

27720079 is an equidigital number, since it uses as much as digits as its factorization.

27720079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644696.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 27720079 is about 5264.9861348345. The cubic root of 27720079 is about 302.6435955092.

The spelling of 27720079 in words is "twenty-seven million, seven hundred twenty thousand, seventy-nine".