27998829 has 6 divisors (see below), whose sum is σ = 40442766. Its totient is φ = 18665880.

The previous prime is 27998809. The next prime is 27998851. The reversal of 27998829 is 92889972.

It can be written as a sum of positive squares in only one way, i.e., 27846729 + 152100 = 5277^2 + 390^2 .

It is not a de Polignac number, because 27998829 - 2¹¹ = 27996781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27998809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1555482 + ... + 1555499.

It is an arithmetic number, because the mean of its divisors is an integer number (6740461).

Almost surely, 2^27998829 is an apocalyptic number.

It is an amenable number.

27998829 is a deficient number, since it is larger than the sum of its proper divisors (12443937).

27998829 is a wasteful number, since it uses less digits than its factorization.

27998829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110987 (or 3110984 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 27998829 is about 5291.3919718728. The cubic root of 27998829 is about 303.6546639789.

It can be divided in two parts, 2799 and 8829, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 27998829 in words is "twenty-seven million, nine hundred ninety-eight thousand, eight hundred twenty-nine".