27940287 has 4 divisors (see below), whose sum is σ = 37253720. Its totient is φ = 18626856.

The previous prime is 27940277. The next prime is 27940301. The reversal of 27940287 is 78204972.

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

It is a de Polignac number, because none of the positive numbers 2^k-27940287 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 (27940247) 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, 4656712 + ... + 4656717.

It is an arithmetic number, because the mean of its divisors is an integer number (9313430).

Almost surely, 2^27940287 is an apocalyptic number.

27940287 is a deficient number, since it is larger than the sum of its proper divisors (9313433).

27940287 is an equidigital number, since it uses as much as digits as its factorization.

27940287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9313432.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 27940287 is about 5285.8572625450. The cubic root of 27940287 is about 303.4428818450.

The spelling of 27940287 in words is "twenty-seven million, nine hundred forty thousand, two hundred eighty-seven".