27997071 has 8 divisors (see below), whose sum is σ = 37409280. Its totient is φ = 18624792.

The previous prime is 27997069. The next prime is 27997087. The reversal of 27997071 is 17079972.

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

It is not a de Polignac number, because 27997071 - 2¹ = 27997069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997031) 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, 8305 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (4676160).

Almost surely, 2^27997071 is an apocalyptic number.

27997071 is a deficient number, since it is larger than the sum of its proper divisors (9412209).

27997071 is a wasteful number, since it uses less digits than its factorization.

27997071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19965.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 27997071 is about 5291.2258504056. The cubic root of 27997071 is about 303.6483085218.

It can be divided in two parts, 2799 and 7071, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 27997071 in words is "twenty-seven million, nine hundred ninety-seven thousand, seventy-one".