27958813 has 4 divisors (see below), whose sum is σ = 28922940. Its totient is φ = 26994688.

The previous prime is 27958789. The next prime is 27958841. The reversal of 27958813 is 31885972.

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 11009124 + 16949689 = 3318^2 + 4117^2 .

It is a cyclic number.

It is not a de Polignac number, because 27958813 - 2¹⁷ = 27827741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27958813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27958873) 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, 482020 + ... + 482077.

It is an arithmetic number, because the mean of its divisors is an integer number (7230735).

Almost surely, 2^27958813 is an apocalyptic number.

It is an amenable number.

27958813 is a deficient number, since it is larger than the sum of its proper divisors (964127).

27958813 is an equidigital number, since it uses as much as digits as its factorization.

27958813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964126.

The product of its digits is 120960, while the sum is 43.

The square root of 27958813 is about 5287.6093842114. The cubic root of 27958813 is about 303.5099336594.

The spelling of 27958813 in words is "twenty-seven million, nine hundred fifty-eight thousand, eight hundred thirteen".