27561613 has 8 divisors (see below), whose sum is σ = 28816128. Its totient is φ = 26311824.

The previous prime is 27561563. The next prime is 27561617. The reversal of 27561613 is 31616572.

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 27561613 - 2⁹ = 27561101 is a prime.

It is a super-2 number, since 2×27561613² = 1519285022323538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27561617) 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, 16620 + ... + 18202.

It is an arithmetic number, because the mean of its divisors is an integer number (3602016).

Almost surely, 2^27561613 is an apocalyptic number.

27561613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

27561613 is a deficient number, since it is larger than the sum of its proper divisors (1254515).

27561613 is a wasteful number, since it uses less digits than its factorization.

27561613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363.

The product of its digits is 7560, while the sum is 31.

The square root of 27561613 is about 5249.9155231299. The cubic root of 27561613 is about 302.0657905289.

The spelling of 27561613 in words is "twenty-seven million, five hundred sixty-one thousand, six hundred thirteen".