81395622 has 48 divisors (see below), whose sum is σ = 219877632. Its totient is φ = 21141360.

The previous prime is 81395621. The next prime is 81395623. The reversal of 81395622 is 22659318.

It is an interprime number because it is at equal distance from previous prime (81395621) and next prime (81395623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81395621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27978 + ... + 30749.

It is an arithmetic number, because the mean of its divisors is an integer number (4580784).

Almost surely, 2^81395622 is an apocalyptic number.

81395622 is an abundant number, since it is smaller than the sum of its proper divisors (138482010).

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

81395622 is a wasteful number, since it uses less digits than its factorization.

81395622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58753 (or 58750 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 81395622 is about 9021.9522277609. The cubic root of 81395622 is about 433.3781540753.

The spelling of 81395622 in words is "eighty-one million, three hundred ninety-five thousand, six hundred twenty-two".