81092808 has 48 divisors (see below), whose sum is σ = 220257180. Its totient is φ = 26953344.

The previous prime is 81092783. The next prime is 81092819. The reversal of 81092808 is 80829018.

It can be written as a sum of positive squares in 2 ways, for example, as 77475204 + 3617604 = 8802^2 + 1902^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27166 + ... + 30002.

Almost surely, 2^81092808 is an apocalyptic number.

It is an amenable number.

81092808 is an abundant number, since it is smaller than the sum of its proper divisors (139164372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81092808 is a wasteful number, since it uses less digits than its factorization.

81092808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 3239 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 81092808 is about 9005.1545239379. The cubic root of 81092808 is about 432.8400577700.

The spelling of 81092808 in words is "eighty-one million, ninety-two thousand, eight hundred eight".