81102768 has 20 divisors (see below), whose sum is σ = 209515608. Its totient is φ = 27034240.

The previous prime is 81102751. The next prime is 81102817. The reversal of 81102768 is 86720118.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844773 + ... + 844868.

Almost surely, 2^81102768 is an apocalyptic number.

It is an amenable number.

81102768 is an abundant number, since it is smaller than the sum of its proper divisors (128412840).

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

81102768 is a wasteful number, since it uses less digits than its factorization.

81102768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689652 (or 1689646 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 81102768 is about 9005.7075235653. The cubic root of 81102768 is about 432.8577778391.

It can be divided in two parts, 8110 and 2768, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 81102768 in words is "eighty-one million, one hundred two thousand, seven hundred sixty-eight".