27981093996 has 18 divisors (see below), whose sum is σ = 70729987692. Its totient is φ = 9327031320.

The previous prime is 27981093989. The next prime is 27981093997. The reversal of 27981093996 is 69939018972.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (27981093997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388626270 + ... + 388626341.

Almost surely, 2^27981093996 is an apocalyptic number.

It is an amenable number.

27981093996 is an abundant number, since it is smaller than the sum of its proper divisors (42748893696).

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

27981093996 is a wasteful number, since it uses less digits than its factorization.

27981093996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777252621 (or 777252616 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 27981093996 in words is "twenty-seven billion, nine hundred eighty-one million, ninety-three thousand, nine hundred ninety-six".