27913561 has 12 divisors (see below), whose sum is σ = 30378000. Its totient is φ = 25637040.

The previous prime is 27913537. The next prime is 27913591. The reversal of 27913561 is 16531972.

It is not a de Polignac number, because 27913561 - 2¹³ = 27905369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27913591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55690 + ... + 56188.

It is an arithmetic number, because the mean of its divisors is an integer number (2531500).

Almost surely, 2^27913561 is an apocalyptic number.

It is an amenable number.

27913561 is a deficient number, since it is larger than the sum of its proper divisors (2464439).

27913561 is a wasteful number, since it uses less digits than its factorization.

27913561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 843 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 27913561 is about 5283.3285909548. The cubic root of 27913561 is about 303.3460992360.

The spelling of 27913561 in words is "twenty-seven million, nine hundred thirteen thousand, five hundred sixty-one".