27640032678 has 64 divisors (see below), whose sum is σ = 64814112000. Its totient is φ = 8706958272.

The previous prime is 27640032643. The next prime is 27640032689. The reversal of 27640032678 is 87623004672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386701 + ... + 452567.

It is an arithmetic number, because the mean of its divisors is an integer number (1012720500).

Almost surely, 2^27640032678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27640032678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32407056000).

27640032678 is an abundant number, since it is smaller than the sum of its proper divisors (37174079322).

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

27640032678 is a wasteful number, since it uses less digits than its factorization.

27640032678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66306 (or 66300 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 27640032678 in words is "twenty-seven billion, six hundred forty million, thirty-two thousand, six hundred seventy-eight".