27820137 has 4 divisors (see below), whose sum is σ = 37093520. Its totient is φ = 18546756.

The previous prime is 27820127. The next prime is 27820141. The reversal of 27820137 is 73102872.

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 27820137 - 2¹⁵ = 27787369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27820127) 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, 4636687 + ... + 4636692.

It is an arithmetic number, because the mean of its divisors is an integer number (9273380).

Almost surely, 2^27820137 is an apocalyptic number.

It is an amenable number.

27820137 is a deficient number, since it is larger than the sum of its proper divisors (9273383).

27820137 is an equidigital number, since it uses as much as digits as its factorization.

27820137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9273382.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 27820137 is about 5274.4797847750. The cubic root of 27820137 is about 303.0072975837.

The spelling of 27820137 in words is "twenty-seven million, eight hundred twenty thousand, one hundred thirty-seven".