27999856 has 10 divisors (see below), whose sum is σ = 54249752. Its totient is φ = 13999920.

The previous prime is 27999841. The next prime is 27999857. The reversal of 27999856 is 65899972.

It is a junction number, because it is equal to n+sod(n) for n = 27999797 and 27999806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27999857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 874980 + ... + 875011.

Almost surely, 2^27999856 is an apocalyptic number.

It is an amenable number.

27999856 is a deficient number, since it is larger than the sum of its proper divisors (26249896).

27999856 is a wasteful number, since it uses less digits than its factorization.

27999856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749999 (or 1749993 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The square root of 27999856 is about 5291.4890153907. The cubic root of 27999856 is about 303.6583766286.

The spelling of 27999856 in words is "twenty-seven million, nine hundred ninety-nine thousand, eight hundred fifty-six".