27787640015 has 4 divisors (see below), whose sum is σ = 33345168024. Its totient is φ = 22230112008.

The previous prime is 27787639967. The next prime is 27787640029. The reversal of 27787640015 is 51004678772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27787640015 - 2¹⁴ = 27787623631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778763997 + ... + 2778764006.

It is an arithmetic number, because the mean of its divisors is an integer number (8336292006).

Almost surely, 2^27787640015 is an apocalyptic number.

27787640015 is a deficient number, since it is larger than the sum of its proper divisors (5557528009).

27787640015 is an equidigital number, since it uses as much as digits as its factorization.

27787640015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557528008.

The product of its (nonzero) digits is 658560, while the sum is 47.

The spelling of 27787640015 in words is "twenty-seven billion, seven hundred eighty-seven million, six hundred forty thousand, fifteen".