27967861 has 8 divisors (see below), whose sum is σ = 28995480. Its totient is φ = 26944512.

The previous prime is 27967847. The next prime is 27967949. The reversal of 27967861 is 16876972.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6345361 + 21622500 = 2519^2 + 4650^2 .

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 27967861 - 2¹³ = 27959669 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 (27967811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18801 + ... + 20233.

It is an arithmetic number, because the mean of its divisors is an integer number (3624435).

Almost surely, 2^27967861 is an apocalyptic number.

It is an amenable number.

27967861 is a deficient number, since it is larger than the sum of its proper divisors (1027619).

27967861 is a wasteful number, since it uses less digits than its factorization.

27967861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its digits is 254016, while the sum is 46.

The square root of 27967861 is about 5288.4649001388. The cubic root of 27967861 is about 303.5426706441.

The spelling of 27967861 in words is "twenty-seven million, nine hundred sixty-seven thousand, eight hundred sixty-one".