27768742815 has 32 divisors (see below), whose sum is σ = 48535958016. Its totient is φ = 13445055360.

The previous prime is 27768742811. The next prime is 27768742829. The reversal of 27768742815 is 51824786772.

It is not a de Polignac number, because 27768742815 - 2² = 27768742811 is a prime.

It is a super-2 number, since 2×27768742815² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27768742811) 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, 4209 + ... + 235701.

It is an arithmetic number, because the mean of its divisors is an integer number (1516748688).

Almost surely, 2^27768742815 is an apocalyptic number.

27768742815 is a deficient number, since it is larger than the sum of its proper divisors (20767215201).

27768742815 is a wasteful number, since it uses less digits than its factorization.

27768742815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232239.

The product of its digits is 10536960, while the sum is 57.

The spelling of 27768742815 in words is "twenty-seven billion, seven hundred sixty-eight million, seven hundred forty-two thousand, eight hundred fifteen".