27756961 has 4 divisors (see below), whose sum is σ = 28171312. Its totient is φ = 27342612.

The previous prime is 27756917. The next prime is 27756991. The reversal of 27756961 is 16965772.

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 27756961 - 2¹¹ = 27754913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27756901) 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, 207075 + ... + 207208.

It is an arithmetic number, because the mean of its divisors is an integer number (7042828).

Almost surely, 2^27756961 is an apocalyptic number.

It is an amenable number.

27756961 is a deficient number, since it is larger than the sum of its proper divisors (414351).

27756961 is an equidigital number, since it uses as much as digits as its factorization.

27756961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414350.

The product of its digits is 158760, while the sum is 43.

The square root of 27756961 is about 5268.4875438782. The cubic root of 27756961 is about 302.7777600414. Note that the first 4 decimals are identical.

The spelling of 27756961 in words is "twenty-seven million, seven hundred fifty-six thousand, nine hundred sixty-one".