27639756642 has 16 divisors (see below), whose sum is σ = 55286599392. Its totient is φ = 9212071200.

The previous prime is 27639756611. The next prime is 27639756649. The reversal of 27639756642 is 24665793672.

It is a super-2 number, since 2×27639756642² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27639756649) 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, 243859 + ... + 338742.

It is an arithmetic number, because the mean of its divisors is an integer number (3455412462).

Almost surely, 2^27639756642 is an apocalyptic number.

27639756642 is an abundant number, since it is smaller than the sum of its proper divisors (27646842750).

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

27639756642 is a wasteful number, since it uses less digits than its factorization.

27639756642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590513.

The product of its digits is 22861440, while the sum is 57.

The spelling of 27639756642 in words is "twenty-seven billion, six hundred thirty-nine million, seven hundred fifty-six thousand, six hundred forty-two".