81422000 has 80 divisors (see below), whose sum is σ = 214834464. Its totient is φ = 29600000.

The previous prime is 81421987. The next prime is 81422009. The reversal of 81422000 is 22418.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 81422000.

It is not an unprimeable number, because it can be changed into a prime (81422009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20150 + ... + 23850.

Almost surely, 2^81422000 is an apocalyptic number.

81422000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81422000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107417232).

81422000 is an abundant number, since it is smaller than the sum of its proper divisors (133412464).

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

81422000 is a wasteful number, since it uses less digits than its factorization.

81422000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735 (or 3719 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 81422000 is about 9023.4139880646. The cubic root of 81422000 is about 433.4249641862.

Adding to 81422000 its reverse (22418), we get a palindrome (81444418).

The spelling of 81422000 in words is "eighty-one million, four hundred twenty-two thousand".