27977961 has 8 divisors (see below), whose sum is σ = 40695264. Its totient is φ = 16956320.

The previous prime is 27977923. The next prime is 27977981. The reversal of 27977961 is 16977972.

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 27977961 - 2⁶ = 27977897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27977961.

It is not an unprimeable number, because it can be changed into a prime (27977981) 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, 423876 + ... + 423941.

It is an arithmetic number, because the mean of its divisors is an integer number (5086908).

Almost surely, 2^27977961 is an apocalyptic number.

It is an amenable number.

27977961 is a deficient number, since it is larger than the sum of its proper divisors (12717303).

27977961 is a wasteful number, since it uses less digits than its factorization.

27977961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847831.

The product of its digits is 333396, while the sum is 48.

The square root of 27977961 is about 5289.4197224270. The cubic root of 27977961 is about 303.5792055796.

The spelling of 27977961 in words is "twenty-seven million, nine hundred seventy-seven thousand, nine hundred sixty-one".