27764389 has 2 divisors, whose sum is σ = 27764390. Its totient is φ = 27764388.

The previous prime is 27764353. The next prime is 27764411. The reversal of 27764389 is 98346772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16136289 + 11628100 = 4017^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 27764389 - 2⁹ = 27763877 is a prime.

It is a super-2 number, since 2×27764389² = 1541722593086642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27762389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13882194 + 13882195.

It is an arithmetic number, because the mean of its divisors is an integer number (13882195).

Almost surely, 2^27764389 is an apocalyptic number.

It is an amenable number.

27764389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27764389 is an equidigital number, since it uses as much as digits as its factorization.

27764389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 27764389 is about 5269.1924428702. The cubic root of 27764389 is about 302.8047662713.

The spelling of 27764389 in words is "twenty-seven million, seven hundred sixty-four thousand, three hundred eighty-nine".