81065758 has 16 divisors (see below), whose sum is σ = 128964960. Its totient is φ = 38085376.

The previous prime is 81065749. The next prime is 81065783. The reversal of 81065758 is 85756018.

It is a super-2 number, since 2×81065758² = 13143314240229128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81065758.

It is a congruent number.

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, 23658 + ... + 26866.

It is an arithmetic number, because the mean of its divisors is an integer number (8060310).

Almost surely, 2^81065758 is an apocalyptic number.

81065758 is a deficient number, since it is larger than the sum of its proper divisors (47899202).

81065758 is a wasteful number, since it uses less digits than its factorization.

81065758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 81065758 is about 9003.6524810768. The cubic root of 81065758 is about 432.7919251594.

The spelling of 81065758 in words is "eighty-one million, sixty-five thousand, seven hundred fifty-eight".