27806396672 has 72 divisors (see below), whose sum is σ = 55966813056. Its totient is φ = 13787856896.

The previous prime is 27806396671. The next prime is 27806396689. The reversal of 27806396672 is 27669360872.

It is a happy number.

It is a super-2 number, since 2×27806396672² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27806396671) 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, 17302493 + ... + 17304099.

It is an arithmetic number, because the mean of its divisors is an integer number (777316848).

Almost surely, 2^27806396672 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 27806396672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27983406528).

27806396672 is an abundant number, since it is smaller than the sum of its proper divisors (28160416384).

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

27806396672 is a wasteful number, since it uses less digits than its factorization.

27806396672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2129 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 27806396672 in words is "twenty-seven billion, eight hundred six million, three hundred ninety-six thousand, six hundred seventy-two".