27896561 has 8 divisors (see below), whose sum is σ = 34780224. Its totient is φ = 21737520.

The previous prime is 27896543. The next prime is 27896563. The reversal of 27896561 is 16569872.

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

It is a de Polignac number, because none of the positive numbers 2^k-27896561 is a prime.

It is a super-5 number, since 5×27896561⁵ (a number of 38 digits) contains 55555 as substring.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27896563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181070 + ... + 181223.

It is an arithmetic number, because the mean of its divisors is an integer number (4347528).

Almost surely, 2^27896561 is an apocalyptic number.

It is an amenable number.

27896561 is a deficient number, since it is larger than the sum of its proper divisors (6883663).

27896561 is a wasteful number, since it uses less digits than its factorization.

27896561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362311.

The product of its digits is 181440, while the sum is 44.

The square root of 27896561 is about 5281.7195116742. The cubic root of 27896561 is about 303.2845051488.

The spelling of 27896561 in words is "twenty-seven million, eight hundred ninety-six thousand, five hundred sixty-one".