27649979 has 16 divisors (see below), whose sum is σ = 33149952. Its totient is φ = 22548768.

The previous prime is 27649961. The next prime is 27649981. The reversal of 27649979 is 97994672.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27649979 - 2⁸ = 27649723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27649979.

It is not an unprimeable number, because it can be changed into a prime (27649079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42017 + ... + 42669.

It is an arithmetic number, because the mean of its divisors is an integer number (2071872).

Almost surely, 2^27649979 is an apocalyptic number.

27649979 is a deficient number, since it is larger than the sum of its proper divisors (5499973).

27649979 is a wasteful number, since it uses less digits than its factorization.

27649979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946.

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

The square root of 27649979 is about 5258.3247332206. The cubic root of 27649979 is about 302.3882664547.

The spelling of 27649979 in words is "twenty-seven million, six hundred forty-nine thousand, nine hundred seventy-nine".