27972977 has 2 divisors, whose sum is σ = 27972978. Its totient is φ = 27972976.

The previous prime is 27972961. The next prime is 27972979. The reversal of 27972977 is 77927972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22572001 + 5400976 = 4751^2 + 2324^2 .

It is a cyclic number.

It is not a de Polignac number, because 27972977 - 2⁴ = 27972961 is a prime.

Together with 27972979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27972979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13986488 + 13986489.

It is an arithmetic number, because the mean of its divisors is an integer number (13986489).

Almost surely, 2^27972977 is an apocalyptic number.

It is an amenable number.

27972977 is a deficient number, since it is larger than the sum of its proper divisors (1).

27972977 is an equidigital number, since it uses as much as digits as its factorization.

27972977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777924, while the sum is 50.

The square root of 27972977 is about 5288.9485722590. The cubic root of 27972977 is about 303.5611779541.

The spelling of 27972977 in words is "twenty-seven million, nine hundred seventy-two thousand, nine hundred seventy-seven".