27955813 has 2 divisors, whose sum is σ = 27955814. Its totient is φ = 27955812.

The previous prime is 27955801. The next prime is 27955841. The reversal of 27955813 is 31855972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25786084 + 2169729 = 5078^2 + 1473^2 .

It is a cyclic number.

It is not a de Polignac number, because 27955813 - 2²¹ = 25858661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27955843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977906 + 13977907.

It is an arithmetic number, because the mean of its divisors is an integer number (13977907).

Almost surely, 2^27955813 is an apocalyptic number.

It is an amenable number.

27955813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27955813 is an equidigital number, since it uses as much as digits as its factorization.

27955813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 27955813 is about 5287.3256945265. The cubic root of 27955813 is about 303.4990776624.

It can be divided in two parts, 2795581 and 3, that added together give a square (2795584 = 1672²).

The spelling of 27955813 in words is "twenty-seven million, nine hundred fifty-five thousand, eight hundred thirteen".