27979649 has 2 divisors, whose sum is σ = 27979650. Its totient is φ = 27979648.

The previous prime is 27979643. The next prime is 27979657. The reversal of 27979649 is 94697972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15249025 + 12730624 = 3905^2 + 3568^2 .

It is a cyclic number.

It is not a de Polignac number, because 27979649 - 2¹⁶ = 27914113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27979649.

It is not a weakly prime, because it can be changed into another prime (27979643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989824 + 13989825.

It is an arithmetic number, because the mean of its divisors is an integer number (13989825).

Almost surely, 2^27979649 is an apocalyptic number.

It is an amenable number.

27979649 is a deficient number, since it is larger than the sum of its proper divisors (1).

27979649 is an equidigital number, since it uses as much as digits as its factorization.

27979649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 27979649 is about 5289.5792838372. The cubic root of 27979649 is about 303.5853107588.

The spelling of 27979649 in words is "twenty-seven million, nine hundred seventy-nine thousand, six hundred forty-nine".