27993890 has 16 divisors (see below), whose sum is σ = 50725440. Its totient is φ = 11122800.

The previous prime is 27993877. The next prime is 27993913. The reversal of 27993890 is 9839972.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7760 + ... + 10779.

It is an arithmetic number, because the mean of its divisors is an integer number (3170340).

Almost surely, 2^27993890 is an apocalyptic number.

27993890 is a deficient number, since it is larger than the sum of its proper divisors (22731550).

27993890 is a wasteful number, since it uses less digits than its factorization.

27993890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18697.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 27993890 is about 5290.9252498972. The cubic root of 27993890 is about 303.6368080110.

The spelling of 27993890 in words is "twenty-seven million, nine hundred ninety-three thousand, eight hundred ninety".