27802991 has 4 divisors (see below), whose sum is σ = 28394592. Its totient is φ = 27211392.

The previous prime is 27802981. The next prime is 27802993. The reversal of 27802991 is 19920872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27802991 - 2⁶ = 27802927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27802993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295730 + ... + 295823.

It is an arithmetic number, because the mean of its divisors is an integer number (7098648).

Almost surely, 2^27802991 is an apocalyptic number.

27802991 is a deficient number, since it is larger than the sum of its proper divisors (591601).

27802991 is an equidigital number, since it uses as much as digits as its factorization.

27802991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591600.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 27802991 is about 5272.8541606989. The cubic root of 27802991 is about 302.9450353596.

The spelling of 27802991 in words is "twenty-seven million, eight hundred two thousand, nine hundred ninety-one".