27696961 has 4 divisors (see below), whose sum is σ = 29326212. Its totient is φ = 26067712.

The previous prime is 27696931. The next prime is 27696971. The reversal of 27696961 is 16969672.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 20079361 = 2760^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 27696961 - 2⁷ = 27696833 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27696931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814600 + ... + 814633.

It is an arithmetic number, because the mean of its divisors is an integer number (7331553).

Almost surely, 2^27696961 is an apocalyptic number.

It is an amenable number.

27696961 is a deficient number, since it is larger than the sum of its proper divisors (1629251).

27696961 is a wasteful number, since it uses less digits than its factorization.

27696961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629250.

The product of its digits is 244944, while the sum is 46.

The square root of 27696961 is about 5262.7902295265. The cubic root of 27696961 is about 302.5594391770.

It can be divided in two parts, 2769 and 6961, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 27696961 in words is "twenty-seven million, six hundred ninety-six thousand, nine hundred sixty-one".