27681212920 has 32 divisors (see below), whose sum is σ = 62887425120. Its totient is φ = 10964983680.

The previous prime is 27681212899. The next prime is 27681212921. The reversal of 27681212920 is 2921218672.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681212921) 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, 3355251 + ... + 3363490.

It is an arithmetic number, because the mean of its divisors is an integer number (1965232035).

Almost surely, 2^27681212920 is an apocalyptic number.

27681212920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27681212920 is an abundant number, since it is smaller than the sum of its proper divisors (35206212200).

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

27681212920 is a wasteful number, since it uses less digits than its factorization.

27681212920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718855 (or 6718851 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 27681212920 in words is "twenty-seven billion, six hundred eighty-one million, two hundred twelve thousand, nine hundred twenty".