27726678243 has 32 divisors (see below), whose sum is σ = 44882112000. Its totient is φ = 16777303200.

The previous prime is 27726678209. The next prime is 27726678257. The reversal of 27726678243 is 34287662772.

It is a happy number.

27726678243 is a `hidden beast` number, since 2 + 77 + 266 + 78 + 243 = 666.

It is not a de Polignac number, because 27726678243 - 2⁸ = 27726677987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27726678243.

It is not an unprimeable number, because it can be changed into a prime (27726678263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113433 + ... + 261381.

It is an arithmetic number, because the mean of its divisors is an integer number (1402566000).

Almost surely, 2^27726678243 is an apocalyptic number.

27726678243 is a deficient number, since it is larger than the sum of its proper divisors (17155433757).

27726678243 is a wasteful number, since it uses less digits than its factorization.

27726678243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148600 (or 148594 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 54.

The spelling of 27726678243 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred seventy-eight thousand, two hundred forty-three".