27800991312 has 20 divisors (see below), whose sum is σ = 71819227680. Its totient is φ = 9266997088.

The previous prime is 27800991307. The next prime is 27800991313. The reversal of 27800991312 is 21319900872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27800991313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289593612 + ... + 289593707.

It is an arithmetic number, because the mean of its divisors is an integer number (3590961384).

Almost surely, 2^27800991312 is an apocalyptic number.

It is an amenable number.

27800991312 is an abundant number, since it is smaller than the sum of its proper divisors (44018236368).

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

27800991312 is a wasteful number, since it uses less digits than its factorization.

27800991312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579187330 (or 579187324 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 27800991312 in words is "twenty-seven billion, eight hundred million, nine hundred ninety-one thousand, three hundred twelve".