27780292809 has 12 divisors (see below), whose sum is σ = 40610549616. Its totient is φ = 18297059832.

The previous prime is 27780292783. The next prime is 27780292817. The reversal of 27780292809 is 90829208772.

27780292809 is a `hidden beast` number, since 277 + 8 + 0 + 292 + 80 + 9 = 666.

It is not a de Polignac number, because 27780292809 - 2¹⁶ = 27780227273 is a prime.

It is a super-2 number, since 2×27780292809² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (27780292829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18593827 + ... + 18595320.

It is an arithmetic number, because the mean of its divisors is an integer number (3384212468).

Almost surely, 2^27780292809 is an apocalyptic number.

It is an amenable number.

27780292809 is a deficient number, since it is larger than the sum of its proper divisors (12830256807).

27780292809 is a wasteful number, since it uses less digits than its factorization.

27780292809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37189236 (or 37189233 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 27780292809 in words is "twenty-seven billion, seven hundred eighty million, two hundred ninety-two thousand, eight hundred nine".