27975971 has 4 divisors (see below), whose sum is σ = 28450200. Its totient is φ = 27501744.

The previous prime is 27975953. The next prime is 27975977. The reversal of 27975971 is 17957972.

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

It is a cyclic number.

It is not a de Polignac number, because 27975971 - 2⁶ = 27975907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27975977) 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, 237026 + ... + 237143.

It is an arithmetic number, because the mean of its divisors is an integer number (7112550).

Almost surely, 2^27975971 is an apocalyptic number.

27975971 is a deficient number, since it is larger than the sum of its proper divisors (474229).

27975971 is an equidigital number, since it uses as much as digits as its factorization.

27975971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474228.

The product of its digits is 277830, while the sum is 47.

The square root of 27975971 is about 5289.2316077101. The cubic root of 27975971 is about 303.5720078078.

The spelling of 27975971 in words is "twenty-seven million, nine hundred seventy-five thousand, nine hundred seventy-one".