27679865856 has 88 divisors (see below), whose sum is σ = 73879177680. Its totient is φ = 9213837312.

The previous prime is 27679865833. The next prime is 27679865887. The reversal of 27679865856 is 65856897672.

It is a happy number.

It is a super-2 number, since 2×27679865856² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2356510 + ... + 2368226.

It is an arithmetic number, because the mean of its divisors is an integer number (839536110).

Almost surely, 2^27679865856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27679865856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36939588840).

27679865856 is an abundant number, since it is smaller than the sum of its proper divisors (46199311824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27679865856 is a wasteful number, since it uses less digits than its factorization.

27679865856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12509 (or 12491 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 69.

The spelling of 27679865856 in words is "twenty-seven billion, six hundred seventy-nine million, eight hundred sixty-five thousand, eight hundred fifty-six".