27994861 has 4 divisors (see below), whose sum is σ = 28309500. Its totient is φ = 27680224.

The previous prime is 27994859. The next prime is 27994867. The reversal of 27994861 is 16849972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9418761 + 18576100 = 3069^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 27994861 - 2¹ = 27994859 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 (27994867) 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, 157186 + ... + 157363.

It is an arithmetic number, because the mean of its divisors is an integer number (7077375).

Almost surely, 2^27994861 is an apocalyptic number.

It is an amenable number.

27994861 is a deficient number, since it is larger than the sum of its proper divisors (314639).

27994861 is an equidigital number, since it uses as much as digits as its factorization.

27994861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314638.

The product of its digits is 217728, while the sum is 46.

The square root of 27994861 is about 5291.0170099897. The cubic root of 27994861 is about 303.6403186334.

The spelling of 27994861 in words is "twenty-seven million, nine hundred ninety-four thousand, eight hundred sixty-one".