27997760687 has 12 divisors (see below), whose sum is σ = 30329329320. Its totient is φ = 25833663648.

The previous prime is 27997760677. The next prime is 27997760711. The reversal of 27997760687 is 78606779972.

It is not a de Polignac number, because 27997760687 - 2²² = 27993566383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997760677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 403733 + ... + 467969.

It is an arithmetic number, because the mean of its divisors is an integer number (2527444110).

Almost surely, 2^27997760687 is an apocalyptic number.

27997760687 is a deficient number, since it is larger than the sum of its proper divisors (2331568633).

27997760687 is a wasteful number, since it uses less digits than its factorization.

27997760687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66842 (or 66829 counting only the distinct ones).

The product of its (nonzero) digits is 112021056, while the sum is 68.

The spelling of 27997760687 in words is "twenty-seven billion, nine hundred ninety-seven million, seven hundred sixty thousand, six hundred eighty-seven".