81653682 has 16 divisors (see below), whose sum is σ = 178153632. Its totient is φ = 24743520.

The previous prime is 81653681. The next prime is 81653701. The reversal of 81653682 is 28635618.

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 81653682.

It is not an unprimeable number, because it can be changed into a prime (81653681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618523 + ... + 618654.

It is an arithmetic number, because the mean of its divisors is an integer number (11134602).

Almost surely, 2^81653682 is an apocalyptic number.

81653682 is an abundant number, since it is smaller than the sum of its proper divisors (96499950).

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

81653682 is a wasteful number, since it uses less digits than its factorization.

81653682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237193.

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

The square root of 81653682 is about 9036.2426926240. The cubic root of 81653682 is about 433.8356708310.

It can be divided in two parts, 816536 and 82, that added together give a palindrome (816618).

The spelling of 81653682 in words is "eighty-one million, six hundred fifty-three thousand, six hundred eighty-two".