27991022 has 8 divisors (see below), whose sum is σ = 42963096. Its totient is φ = 13669992.

The previous prime is 27991013. The next prime is 27991031. The reversal of 27991022 is 22019972.

It is an interprime number because it is at equal distance from previous prime (27991013) and next prime (27991031).

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

It is a self number, because there is not a number n which added to its sum of digits gives 27991022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162653 + ... + 162824.

It is an arithmetic number, because the mean of its divisors is an integer number (5370387).

Almost surely, 2^27991022 is an apocalyptic number.

27991022 is a deficient number, since it is larger than the sum of its proper divisors (14972074).

27991022 is a wasteful number, since it uses less digits than its factorization.

27991022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325522.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 27991022 is about 5290.6542128550. The cubic root of 27991022 is about 303.6264383660.

The spelling of 27991022 in words is "twenty-seven million, nine hundred ninety-one thousand, twenty-two".