27958129 has 4 divisors (see below), whose sum is σ = 27977076. Its totient is φ = 27939184.

The previous prime is 27958123. The next prime is 27958157. The reversal of 27958129 is 92185972.

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 8111104 + 19847025 = 2848^2 + 4455^2 .

It is a cyclic number.

It is not a de Polignac number, because 27958129 - 2⁵ = 27958097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27958123) 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, 7054 + ... + 10279.

It is an arithmetic number, because the mean of its divisors is an integer number (6994269).

Almost surely, 2^27958129 is an apocalyptic number.

It is an amenable number.

27958129 is a deficient number, since it is larger than the sum of its proper divisors (18947).

27958129 is a wasteful number, since it uses less digits than its factorization.

27958129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18946.

The product of its digits is 90720, while the sum is 43.

The square root of 27958129 is about 5287.5447043027. The cubic root of 27958129 is about 303.5074585604.

The spelling of 27958129 in words is "twenty-seven million, nine hundred fifty-eight thousand, one hundred twenty-nine".