27298661 has 8 divisors (see below), whose sum is σ = 30116184. Its totient is φ = 24583680.

The previous prime is 27298633. The next prime is 27298699. The reversal of 27298661 is 16689272.

27298661 = 3694² + 3695².

It can be written as a sum of positive squares in 4 ways, for example, as 776161 + 26522500 = 881^2 + 5150^2 .

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 27298661 - 2⁶ = 27298597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27298261) 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 7 ways as a sum of consecutive naturals, for example, 25076 + ... + 26141.

It is an arithmetic number, because the mean of its divisors is an integer number (3764523).

Almost surely, 2^27298661 is an apocalyptic number.

27298661 is the 3695-th centered square number.

It is an amenable number.

27298661 is a deficient number, since it is larger than the sum of its proper divisors (2817523).

27298661 is a wasteful number, since it uses less digits than its factorization.

27298661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51271.

The product of its digits is 72576, while the sum is 41.

The square root of 27298661 is about 5224.8120540360. The cubic root of 27298661 is about 301.1020981594.

The spelling of 27298661 in words is "twenty-seven million, two hundred ninety-eight thousand, six hundred sixty-one".