27816290861 has 8 divisors (see below), whose sum is σ = 28083273240. Its totient is φ = 27549523008.

The previous prime is 27816290857. The next prime is 27816290869. The reversal of 27816290861 is 16809261872.

It can be written as a sum of positive squares in 4 ways, for example, as 6738768100 + 21077522761 = 82090^2 + 145181^2 .

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 27816290861 - 2² = 27816290857 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 (27816290869) 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, 213275 + ... + 317991.

It is an arithmetic number, because the mean of its divisors is an integer number (3510409155).

Almost surely, 2^27816290861 is an apocalyptic number.

It is an amenable number.

27816290861 is a deficient number, since it is larger than the sum of its proper divisors (266982379).

27816290861 is a wasteful number, since it uses less digits than its factorization.

27816290861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107263.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 27816290861 in words is "twenty-seven billion, eight hundred sixteen million, two hundred ninety thousand, eight hundred sixty-one".