27640069 has 4 divisors (see below), whose sum is σ = 27687744. Its totient is φ = 27592396.

The previous prime is 27640057. The next prime is 27640141. The reversal of 27640069 is 96004672.

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 a cyclic number.

It is not a de Polignac number, because 27640069 - 2²¹ = 25542917 is a prime.

It is a super-2 number, since 2×27640069² = 1527946828649522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27640169) 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, 22957 + ... + 24130.

It is an arithmetic number, because the mean of its divisors is an integer number (6921936).

Almost surely, 2^27640069 is an apocalyptic number.

It is an amenable number.

27640069 is a deficient number, since it is larger than the sum of its proper divisors (47675).

27640069 is an equidigital number, since it uses as much as digits as its factorization.

27640069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47674.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 27640069 is about 5257.3823334431. The cubic root of 27640069 is about 302.3521359173.

The spelling of 27640069 in words is "twenty-seven million, six hundred forty thousand, sixty-nine".