81626682 has 16 divisors (see below), whose sum is σ = 165221280. Its totient is φ = 26880912.

The previous prime is 81626669. The next prime is 81626683. The reversal of 81626682 is 28662618.

It is a self number, because there is not a number n which added to its sum of digits gives 81626682.

It is not an unprimeable number, because it can be changed into a prime (81626683) 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, 81457 + ... + 82452.

It is an arithmetic number, because the mean of its divisors is an integer number (10326330).

Almost surely, 2^81626682 is an apocalyptic number.

81626682 is an abundant number, since it is smaller than the sum of its proper divisors (83594598).

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

81626682 is a wasteful number, since it uses less digits than its factorization.

81626682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163997.

The product of its digits is 55296, while the sum is 39.

The square root of 81626682 is about 9034.7485853232. The cubic root of 81626682 is about 433.7878474949.

The spelling of 81626682 in words is "eighty-one million, six hundred twenty-six thousand, six hundred eighty-two".