27994681 has 27 divisors (see below), whose sum is σ = 34244973. Its totient is φ = 22857120.

The previous prime is 27994667. The next prime is 27994691. The reversal of 27994681 is 18649972.

The square root of 27994681 is 5291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 116281 + 27878400 = 341^2 + 5280^2 .

It is not a de Polignac number, because 27994681 - 2⁷ = 27994553 is a prime.

It is a super-2 number, since 2×27994681² = 1567404328583522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27994691) 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 26 ways as a sum of consecutive naturals, for example, 756595 + ... + 756631.

Almost surely, 2^27994681 is an apocalyptic number.

27994681 is the 5291-st square number.

27994681 is the 2646-th centered octagonal number.

It is an amenable number.

27994681 is a deficient number, since it is larger than the sum of its proper divisors (6250292).

27994681 is a wasteful number, since it uses less digits than its factorization.

27994681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 61 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The cubic root of 27994681 is about 303.6396678547.

The spelling of 27994681 in words is "twenty-seven million, nine hundred ninety-four thousand, six hundred eighty-one".