27731830643 has 12 divisors (see below), whose sum is σ = 30899667624. Its totient is φ = 24865394400.

The previous prime is 27731830639. The next prime is 27731830661. The reversal of 27731830643 is 34603813772.

It is not a de Polignac number, because 27731830643 - 2² = 27731830639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27731830594 and 27731830603.

It is not an unprimeable number, because it can be changed into a prime (27731830663) 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, 1560953 + ... + 1578618.

It is an arithmetic number, because the mean of its divisors is an integer number (2574972302).

Almost surely, 2^27731830643 is an apocalyptic number.

27731830643 is a deficient number, since it is larger than the sum of its proper divisors (3167836981).

27731830643 is a wasteful number, since it uses less digits than its factorization.

27731830643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139666 (or 3139655 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 27731830643 in words is "twenty-seven billion, seven hundred thirty-one million, eight hundred thirty thousand, six hundred forty-three".