27977797 has 2 divisors, whose sum is σ = 27977798. Its totient is φ = 27977796.

The previous prime is 27977777. The next prime is 27977813. The reversal of 27977797 is 79777972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 2313441 = 5066^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 27977797 - 2⁷ = 27977669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27977777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13988898 + 13988899.

It is an arithmetic number, because the mean of its divisors is an integer number (13988899).

Almost surely, 2^27977797 is an apocalyptic number.

It is an amenable number.

27977797 is a deficient number, since it is larger than the sum of its proper divisors (1).

27977797 is an equidigital number, since it uses as much as digits as its factorization.

27977797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2722734, while the sum is 55.

The square root of 27977797 is about 5289.4042197586. The cubic root of 27977797 is about 303.5786124093.

The spelling of 27977797 in words is "twenty-seven million, nine hundred seventy-seven thousand, seven hundred ninety-seven".