27969643 has 4 divisors (see below), whose sum is σ = 30121168. Its totient is φ = 25818120.

The previous prime is 27969629. The next prime is 27969671. The reversal of 27969643 is 34696972.

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 27969643 - 2⁵ = 27969611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27969593 and 27969602.

It is not an unprimeable number, because it can be changed into a prime (27969673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075743 + ... + 1075768.

It is an arithmetic number, because the mean of its divisors is an integer number (7530292).

Almost surely, 2^27969643 is an apocalyptic number.

27969643 is a deficient number, since it is larger than the sum of its proper divisors (2151525).

27969643 is a wasteful number, since it uses less digits than its factorization.

27969643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151524.

The product of its digits is 489888, while the sum is 46.

The square root of 27969643 is about 5288.6333773481. The cubic root of 27969643 is about 303.5491173479.

The spelling of 27969643 in words is "twenty-seven million, nine hundred sixty-nine thousand, six hundred forty-three".