27980947 has 8 divisors (see below), whose sum is σ = 28396944. Its totient is φ = 27568128.

The previous prime is 27980837. The next prime is 27980987. The reversal of 27980947 is 74908972.

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 27980947 - 2¹⁹ = 27456659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27980897 and 27980906.

It is not an unprimeable number, because it can be changed into a prime (27980987) 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, 21168 + ... + 22450.

It is an arithmetic number, because the mean of its divisors is an integer number (3549618).

Almost surely, 2^27980947 is an apocalyptic number.

27980947 is a deficient number, since it is larger than the sum of its proper divisors (415997).

27980947 is a wasteful number, since it uses less digits than its factorization.

27980947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 27980947 is about 5289.7019764822. The cubic root of 27980947 is about 303.5900052142.

The spelling of 27980947 in words is "twenty-seven million, nine hundred eighty thousand, nine hundred forty-seven".