27964561 has 4 divisors (see below), whose sum is σ = 29436400. Its totient is φ = 26492724.

The previous prime is 27964553. The next prime is 27964567. The reversal of 27964561 is 16546972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27964561 - 2³ = 27964553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27964567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 735891 + ... + 735928.

It is an arithmetic number, because the mean of its divisors is an integer number (7359100).

Almost surely, 2^27964561 is an apocalyptic number.

It is an amenable number.

27964561 is a deficient number, since it is larger than the sum of its proper divisors (1471839).

27964561 is a wasteful number, since it uses less digits than its factorization.

27964561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471838.

The product of its digits is 90720, while the sum is 40.

The square root of 27964561 is about 5288.1528911332. The cubic root of 27964561 is about 303.5307315805.

The spelling of 27964561 in words is "twenty-seven million, nine hundred sixty-four thousand, five hundred sixty-one".