81622998 has 32 divisors (see below), whose sum is σ = 189273600. Its totient is φ = 26024328.

The previous prime is 81622991. The next prime is 81623033. The reversal of 81622998 is 89922618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81622991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31618 + ... + 34101.

It is an arithmetic number, because the mean of its divisors is an integer number (5914800).

Almost surely, 2^81622998 is an apocalyptic number.

81622998 is an abundant number, since it is smaller than the sum of its proper divisors (107650602).

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

81622998 is a wasteful number, since it uses less digits than its factorization.

81622998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65753 (or 65747 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 81622998 is about 9034.5447035255. The cubic root of 81622998 is about 433.7813214488.

The spelling of 81622998 in words is "eighty-one million, six hundred twenty-two thousand, nine hundred ninety-eight".