81989062 has 16 divisors (see below), whose sum is σ = 130693392. Its totient is φ = 38442240.

The previous prime is 81989059. The next prime is 81989069. The reversal of 81989062 is 26098918.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81989069) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5362 + ... + 13882.

It is an arithmetic number, because the mean of its divisors is an integer number (8168337).

Almost surely, 2^81989062 is an apocalyptic number.

81989062 is a deficient number, since it is larger than the sum of its proper divisors (48704330).

81989062 is a wasteful number, since it uses less digits than its factorization.

81989062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8823.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 81989062 is about 9054.7811679797. The cubic root of 81989062 is about 434.4288306697.

The spelling of 81989062 in words is "eighty-one million, nine hundred eighty-nine thousand, sixty-two".