27772973 has 4 divisors (see below), whose sum is σ = 27793788. Its totient is φ = 27752160.

The previous prime is 27772963. The next prime is 27772991. The reversal of 27772973 is 37927772.

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 22306729 + 5466244 = 4723^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 27772973 - 2¹² = 27768877 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 (27772933) 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 3 ways as a sum of consecutive naturals, for example, 8258 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (6948447).

Almost surely, 2^27772973 is an apocalyptic number.

It is an amenable number.

27772973 is a deficient number, since it is larger than the sum of its proper divisors (20815).

27772973 is a wasteful number, since it uses less digits than its factorization.

27772973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20814.

The product of its digits is 259308, while the sum is 44.

The square root of 27772973 is about 5270.0069259917. The cubic root of 27772973 is about 302.8359694105.

The spelling of 27772973 in words is "twenty-seven million, seven hundred seventy-two thousand, nine hundred seventy-three".