81082768 has 40 divisors (see below), whose sum is σ = 169751288. Its totient is φ = 37297152.

The previous prime is 81082759. The next prime is 81082777. The reversal of 81082768 is 86728018.

It is an interprime number because it is at equal distance from previous prime (81082759) and next prime (81082777).

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 79709184 = 1172^2 + 8928^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81082768.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94630 + ... + 95482.

Almost surely, 2^81082768 is an apocalyptic number.

It is an amenable number.

81082768 is an abundant number, since it is smaller than the sum of its proper divisors (88668520).

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

81082768 is a wasteful number, since it uses less digits than its factorization.

81082768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 81082768 is about 9004.5970481749. The cubic root of 81082768 is about 432.8221939024.

The spelling of 81082768 in words is "eighty-one million, eighty-two thousand, seven hundred sixty-eight".