27980643 has 8 divisors (see below), whose sum is σ = 37342800. Its totient is φ = 18636128.

The previous prime is 27980633. The next prime is 27980647. The reversal of 27980643 is 34608972.

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

It is a cyclic number.

It is not a de Polignac number, because 27980643 - 2⁵ = 27980611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27980647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108 + ... + 7481.

It is an arithmetic number, because the mean of its divisors is an integer number (4667850).

Almost surely, 2^27980643 is an apocalyptic number.

27980643 is a deficient number, since it is larger than the sum of its proper divisors (9362157).

27980643 is a wasteful number, since it uses less digits than its factorization.

27980643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 27980643 is about 5289.6732413260. The cubic root of 27980643 is about 303.5889057554.

The spelling of 27980643 in words is "twenty-seven million, nine hundred eighty thousand, six hundred forty-three".