27780769 has 2 divisors, whose sum is σ = 27780770. Its totient is φ = 27780768.

The previous prime is 27780763. The next prime is 27780773. The reversal of 27780769 is 96708772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21344400 + 6436369 = 4620^2 + 2537^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780769 - 2³ = 27780761 is a prime.

It is a super-2 number, since 2×27780769² = 1543542252462722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27780761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890384 + 13890385.

It is an arithmetic number, because the mean of its divisors is an integer number (13890385).

Almost surely, 2^27780769 is an apocalyptic number.

It is an amenable number.

27780769 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780769 is an equidigital number, since it uses as much as digits as its factorization.

27780769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 27780769 is about 5270.7465315646. The cubic root of 27780769 is about 302.8643025715.

The spelling of 27780769 in words is "twenty-seven million, seven hundred eighty thousand, seven hundred sixty-nine".