81037768 has 48 divisors (see below), whose sum is σ = 179703900. Its totient is φ = 34151040.

The previous prime is 81037741. The next prime is 81037783. The reversal of 81037768 is 86773018.

It can be written as a sum of positive squares in 2 ways, for example, as 81036004 + 1764 = 9002^2 + 42^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81037768.

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, 22218 + ... + 25606.

Almost surely, 2^81037768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81037768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89851950).

81037768 is an abundant number, since it is smaller than the sum of its proper divisors (98666132).

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

81037768 is a wasteful number, since it uses less digits than its factorization.

81037768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3459 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81037768 is about 9002.0979776939. The cubic root of 81037768 is about 432.7421086452.

The spelling of 81037768 in words is "eighty-one million, thirty-seven thousand, seven hundred sixty-eight".