27706387720 has 64 divisors (see below), whose sum is σ = 70351675200. Its totient is φ = 9727630080.

The previous prime is 27706387679. The next prime is 27706387747. The reversal of 27706387720 is 2778360772.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072914 + ... + 1098433.

It is an arithmetic number, because the mean of its divisors is an integer number (1099244925).

Almost surely, 2^27706387720 is an apocalyptic number.

27706387720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27706387720 is an abundant number, since it is smaller than the sum of its proper divisors (42645287480).

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

27706387720 is a wasteful number, since it uses less digits than its factorization.

27706387720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171398 (or 2171394 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 49.

The spelling of 27706387720 in words is "twenty-seven billion, seven hundred six million, three hundred eighty-seven thousand, seven hundred twenty".