27978973 has 8 divisors (see below), whose sum is σ = 30603456. Its totient is φ = 25368000.

The previous prime is 27978967. The next prime is 27978983. The reversal of 27978973 is 37987972.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27978973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27978973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978943) 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, 1240 + ... + 7582.

It is an arithmetic number, because the mean of its divisors is an integer number (3825432).

Almost surely, 2^27978973 is an apocalyptic number.

It is an amenable number.

27978973 is a deficient number, since it is larger than the sum of its proper divisors (2624483).

27978973 is a wasteful number, since it uses less digits than its factorization.

27978973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6755.

The product of its digits is 1333584, while the sum is 52.

The square root of 27978973 is about 5289.5153842294. The cubic root of 27978973 is about 303.5828658232.

The spelling of 27978973 in words is "twenty-seven million, nine hundred seventy-eight thousand, nine hundred seventy-three".