27897816 has 64 divisors (see below), whose sum is σ = 74688480. Its totient is φ = 8652800.

The previous prime is 27897803. The next prime is 27897839. The reversal of 27897816 is 61879872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40870 + ... + 41546.

Almost surely, 2^27897816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27897816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37344240).

27897816 is an abundant number, since it is smaller than the sum of its proper divisors (46790664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27897816 is a wasteful number, since it uses less digits than its factorization.

27897816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 800 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 27897816 is about 5281.8383163440. The cubic root of 27897816 is about 303.2890530970.

The spelling of 27897816 in words is "twenty-seven million, eight hundred ninety-seven thousand, eight hundred sixteen".