27430661 has 4 divisors (see below), whose sum is σ = 28874400. Its totient is φ = 25986924.

The previous prime is 27430643. The next prime is 27430679. The reversal of 27430661 is 16603472.

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 an interprime number because it is at equal distance from previous prime (27430643) and next prime (27430679).

It is a cyclic number.

It is not a de Polignac number, because 27430661 - 2⁶ = 27430597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27430621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721841 + ... + 721878.

It is an arithmetic number, because the mean of its divisors is an integer number (7218600).

Almost surely, 2^27430661 is an apocalyptic number.

It is an amenable number.

27430661 is a deficient number, since it is larger than the sum of its proper divisors (1443739).

27430661 is a wasteful number, since it uses less digits than its factorization.

27430661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443738.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 27430661 is about 5237.4288539321. The cubic root of 27430661 is about 301.5866345830.

The spelling of 27430661 in words is "twenty-seven million, four hundred thirty thousand, six hundred sixty-one".