27157681 has 8 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 26382288.

The previous prime is 27157673. The next prime is 27157693. The reversal of 27157681 is 18675172.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27157681 - 2³ = 27157673 is a prime.

It is a super-2 number, since 2×27157681² = 1475079274595522, which contains 22 as substring.

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 27157681.

It is not an unprimeable number, because it can be changed into a prime (27157651) 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 7 ways as a sum of consecutive naturals, for example, 4455 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^27157681 is an apocalyptic number.

It is an amenable number.

27157681 is a deficient number, since it is larger than the sum of its proper divisors (784079).

27157681 is a wasteful number, since it uses less digits than its factorization.

27157681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343.

The product of its digits is 23520, while the sum is 37.

The square root of 27157681 is about 5211.3031959386. The cubic root of 27157681 is about 300.5828705102.

The spelling of 27157681 in words is "twenty-seven million, one hundred fifty-seven thousand, six hundred eighty-one".