27991943763 has 32 divisors (see below), whose sum is σ = 42975109632. Its totient is φ = 15875481600.

The previous prime is 27991943741. The next prime is 27991943783. The reversal of 27991943763 is 36734919972.

It is not a de Polignac number, because 27991943763 - 2²² = 27987749459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27991943697 and 27991943706.

It is not an unprimeable number, because it can be changed into a prime (27991943783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1980883 + ... + 1994963.

It is an arithmetic number, because the mean of its divisors is an integer number (1342972176).

Almost surely, 2^27991943763 is an apocalyptic number.

27991943763 is a deficient number, since it is larger than the sum of its proper divisors (14983165869).

27991943763 is a wasteful number, since it uses less digits than its factorization.

27991943763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795.

The product of its digits is 15431472, while the sum is 60.

The spelling of 27991943763 in words is "twenty-seven billion, nine hundred ninety-one million, nine hundred forty-three thousand, seven hundred sixty-three".