81058738 has 16 divisors (see below), whose sum is σ = 128185344. Its totient is φ = 38386080.

The previous prime is 81058727. The next prime is 81058751. The reversal of 81058738 is 83785018.

It is a self number, because there is not a number n which added to its sum of digits gives 81058738.

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, 10995 + ... + 16822.

It is an arithmetic number, because the mean of its divisors is an integer number (8011584).

Almost surely, 2^81058738 is an apocalyptic number.

81058738 is a deficient number, since it is larger than the sum of its proper divisors (47126606).

81058738 is a wasteful number, since it uses less digits than its factorization.

81058738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27897.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 81058738 is about 9003.2626308467. The cubic root of 81058738 is about 432.7794320629.

It can be divided in two parts, 81058 and 738, that added together give a square (81796 = 286²).

The spelling of 81058738 in words is "eighty-one million, fifty-eight thousand, seven hundred thirty-eight".