81358662 has 64 divisors (see below), whose sum is σ = 204019200. Its totient is φ = 21012480.

The previous prime is 81358639. The next prime is 81358681. The reversal of 81358662 is 26685318.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81358662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105414 + ... + 106182.

It is an arithmetic number, because the mean of its divisors is an integer number (3187800).

Almost surely, 2^81358662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81358662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102009600).

81358662 is an abundant number, since it is smaller than the sum of its proper divisors (122660538).

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

81358662 is a wasteful number, since it uses less digits than its factorization.

81358662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its digits is 69120, while the sum is 39.

The square root of 81358662 is about 9019.9036580221. The cubic root of 81358662 is about 433.3125482470.

The spelling of 81358662 in words is "eighty-one million, three hundred fifty-eight thousand, six hundred sixty-two".