27720057 has 4 divisors (see below), whose sum is σ = 36960080. Its totient is φ = 18480036.

The previous prime is 27720053. The next prime is 27720089. The reversal of 27720057 is 75002772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27720057 - 2² = 27720053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720053) 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, 4620007 + ... + 4620012.

It is an arithmetic number, because the mean of its divisors is an integer number (9240020).

Almost surely, 2^27720057 is an apocalyptic number.

It is an amenable number.

27720057 is a deficient number, since it is larger than the sum of its proper divisors (9240023).

27720057 is an equidigital number, since it uses as much as digits as its factorization.

27720057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240022.

The product of its (nonzero) digits is 6860, while the sum is 30.

The square root of 27720057 is about 5264.9840455599. The cubic root of 27720057 is about 302.6435154450.

The spelling of 27720057 in words is "twenty-seven million, seven hundred twenty thousand, fifty-seven".