81422008 has 8 divisors (see below), whose sum is σ = 152666280. Its totient is φ = 40711000.

The previous prime is 81421987. The next prime is 81422009. The reversal of 81422008 is 80022418.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5088868 + ... + 5088883.

It is an arithmetic number, because the mean of its divisors is an integer number (19083285).

Almost surely, 2^81422008 is an apocalyptic number.

It is an amenable number.

81422008 is a deficient number, since it is larger than the sum of its proper divisors (71244272).

81422008 is a wasteful number, since it uses less digits than its factorization.

81422008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10177757 (or 10177753 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 81422008 is about 9023.4144313558. The cubic root of 81422008 is about 433.4249783814.

It can be divided in two parts, 814 and 22008, that added together give a palindrome (22822).

The spelling of 81422008 in words is "eighty-one million, four hundred twenty-two thousand, eight".