27780491 has 2 divisors, whose sum is σ = 27780492. Its totient is φ = 27780490.

The previous prime is 27780479. The next prime is 27780539. The reversal of 27780491 is 19408772.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27780491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (27780461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890245 + 13890246.

It is an arithmetic number, because the mean of its divisors is an integer number (13890246).

Almost surely, 2^27780491 is an apocalyptic number.

27780491 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780491 is an equidigital number, since it uses as much as digits as its factorization.

27780491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 27780491 is about 5270.7201595228. The cubic root of 27780491 is about 302.8632923216.

The spelling of 27780491 in words is "twenty-seven million, seven hundred eighty thousand, four hundred ninety-one".