27876991 has 4 divisors (see below), whose sum is σ = 29516832. Its totient is φ = 26237152.

The previous prime is 27876983. The next prime is 27876997. The reversal of 27876991 is 19967872.

It is a happy number.

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 27876991 - 2³ = 27876983 is a prime.

It is a super-3 number, since 3×27876991³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27876997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819895 + ... + 819928.

It is an arithmetic number, because the mean of its divisors is an integer number (7379208).

Almost surely, 2^27876991 is an apocalyptic number.

27876991 is a deficient number, since it is larger than the sum of its proper divisors (1639841).

27876991 is a wasteful number, since it uses less digits than its factorization.

27876991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639840.

The product of its digits is 381024, while the sum is 49.

The square root of 27876991 is about 5279.8665702838. The cubic root of 27876991 is about 303.2135684933.

The spelling of 27876991 in words is "twenty-seven million, eight hundred seventy-six thousand, nine hundred ninety-one".