27978899 has 8 divisors (see below), whose sum is σ = 30556512. Its totient is φ = 25462080.

The previous prime is 27978871. The next prime is 27978943. The reversal of 27978899 is 99887972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27978899 - 2¹⁶ = 27913363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27978829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14234 + ... + 16079.

It is an arithmetic number, because the mean of its divisors is an integer number (3819564).

Almost surely, 2^27978899 is an apocalyptic number.

27978899 is a deficient number, since it is larger than the sum of its proper divisors (2577613).

27978899 is a wasteful number, since it uses less digits than its factorization.

27978899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30397.

The product of its digits is 4572288, while the sum is 59.

The square root of 27978899 is about 5289.5083892551. The cubic root of 27978899 is about 303.5825981799.

The spelling of 27978899 in words is "twenty-seven million, nine hundred seventy-eight thousand, eight hundred ninety-nine".