27958261 has 2 divisors, whose sum is σ = 27958262. Its totient is φ = 27958260.

The previous prime is 27958247. The next prime is 27958277. The reversal of 27958261 is 16285972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15952036 + 12006225 = 3994^2 + 3465^2 .

It is a cyclic number.

It is not a de Polignac number, because 27958261 - 2⁹ = 27957749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27958201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13979130 + 13979131.

It is an arithmetic number, because the mean of its divisors is an integer number (13979131).

Almost surely, 2^27958261 is an apocalyptic number.

It is an amenable number.

27958261 is a deficient number, since it is larger than the sum of its proper divisors (1).

27958261 is an equidigital number, since it uses as much as digits as its factorization.

27958261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 27958261 is about 5287.5571864520. The cubic root of 27958261 is about 303.5079362142.

The spelling of 27958261 in words is "twenty-seven million, nine hundred fifty-eight thousand, two hundred sixty-one".