81859662 has 48 divisors (see below), whose sum is σ = 182033280. Its totient is φ = 26577936.

The previous prime is 81859649. The next prime is 81859669. The reversal of 81859662 is 26695818.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81859669) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 123889 + ... + 124547.

It is an arithmetic number, because the mean of its divisors is an integer number (3792360).

Almost surely, 2^81859662 is an apocalyptic number.

81859662 is an abundant number, since it is smaller than the sum of its proper divisors (100173618).

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

81859662 is a wasteful number, since it uses less digits than its factorization.

81859662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 834 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 81859662 is about 9047.6329501146. The cubic root of 81859662 is about 434.2001632139.

The spelling of 81859662 in words is "eighty-one million, eight hundred fifty-nine thousand, six hundred sixty-two".