27978797 has 8 divisors (see below), whose sum is σ = 34882752. Its totient is φ = 21801600.

The previous prime is 27978793. The next prime is 27978827. The reversal of 27978797 is 79787972.

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 27978797 - 2² = 27978793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978791) 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, 181604 + ... + 181757.

It is an arithmetic number, because the mean of its divisors is an integer number (4360344).

Almost surely, 2^27978797 is an apocalyptic number.

It is an amenable number.

27978797 is a deficient number, since it is larger than the sum of its proper divisors (6903955).

27978797 is a wasteful number, since it uses less digits than its factorization.

27978797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363379.

The product of its digits is 3111696, while the sum is 56.

The square root of 27978797 is about 5289.4987475185. The cubic root of 27978797 is about 303.5822292654.

The spelling of 27978797 in words is "twenty-seven million, nine hundred seventy-eight thousand, seven hundred ninety-seven".