27991068 has 24 divisors (see below), whose sum is σ = 74643072. Its totient is φ = 7997424.

The previous prime is 27991057. The next prime is 27991087. The reversal of 27991068 is 86019972.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent 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, 166530 + ... + 166697.

It is an arithmetic number, because the mean of its divisors is an integer number (3110128).

Almost surely, 2^27991068 is an apocalyptic number.

27991068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

27991068 is an abundant number, since it is smaller than the sum of its proper divisors (46652004).

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

27991068 is a wasteful number, since it uses less digits than its factorization.

27991068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333241 (or 333239 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 27991068 is about 5290.6585601416. The cubic root of 27991068 is about 303.6266046908.

The spelling of 27991068 in words is "twenty-seven million, nine hundred ninety-one thousand, sixty-eight".