27640862536 has 64 divisors (see below), whose sum is σ = 61841260800. Its totient is φ = 11324510208.

The previous prime is 27640862531. The next prime is 27640862563. The reversal of 27640862536 is 63526804672.

It is a self number, because there is not a number n which added to its sum of digits gives 27640862536.

It is not an unprimeable number, because it can be changed into a prime (27640862531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2685496 + ... + 2695768.

It is an arithmetic number, because the mean of its divisors is an integer number (966269700).

Almost surely, 2^27640862536 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 27640862536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30920630400).

27640862536 is an abundant number, since it is smaller than the sum of its proper divisors (34200398264).

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

27640862536 is a wasteful number, since it uses less digits than its factorization.

27640862536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12398 (or 12394 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 27640862536 in words is "twenty-seven billion, six hundred forty million, eight hundred sixty-two thousand, five hundred thirty-six".