27965861 has 16 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 20842800.

The previous prime is 27965849. The next prime is 27965863. The reversal of 27965861 is 16856972.

It is not a de Polignac number, because 27965861 - 2⁶ = 27965797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27965863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6125 + ... + 9666.

It is an arithmetic number, because the mean of its divisors is an integer number (2274048).

Almost surely, 2^27965861 is an apocalyptic number.

It is an amenable number.

27965861 is a deficient number, since it is larger than the sum of its proper divisors (8418907).

27965861 is a wasteful number, since it uses less digits than its factorization.

27965861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15832.

The product of its digits is 181440, while the sum is 44.

The square root of 27965861 is about 5288.2758059693. The cubic root of 27965861 is about 303.5354349601.

Subtracting from 27965861 its reverse (16856972), we obtain a square (11108889 = 3333²).

The spelling of 27965861 in words is "twenty-seven million, nine hundred sixty-five thousand, eight hundred sixty-one".