27899129 has 4 divisors (see below), whose sum is σ = 28175460. Its totient is φ = 27622800.

The previous prime is 27899093. The next prime is 27899171. The reversal of 27899129 is 92199872.

It is a happy number.

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 24730729 + 3168400 = 4973^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27899129 is a prime.

It is a super-2 number, since 2×27899129² = 1556722797917282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27899629) 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, 138014 + ... + 138215.

It is an arithmetic number, because the mean of its divisors is an integer number (7043865).

Almost surely, 2^27899129 is an apocalyptic number.

It is an amenable number.

27899129 is a deficient number, since it is larger than the sum of its proper divisors (276331).

27899129 is a wasteful number, since it uses less digits than its factorization.

27899129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276330.

The product of its digits is 163296, while the sum is 47.

The square root of 27899129 is about 5281.9626087279. The cubic root of 27899129 is about 303.2938110834.

The spelling of 27899129 in words is "twenty-seven million, eight hundred ninety-nine thousand, one hundred twenty-nine".