81422664 has 32 divisors (see below), whose sum is σ = 203965440. Its totient is φ = 27086400.

The previous prime is 81422651. The next prime is 81422683. The reversal of 81422664 is 46622418.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9849 + ... + 16119.

It is an arithmetic number, because the mean of its divisors is an integer number (6373920).

Almost surely, 2^81422664 is an apocalyptic number.

It is an amenable number.

81422664 is an abundant number, since it is smaller than the sum of its proper divisors (122542776).

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

81422664 is a wasteful number, since it uses less digits than its factorization.

81422664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821 (or 6817 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 81422664 is about 9023.4507811591. The cubic root of 81422664 is about 433.4261423829.

The spelling of 81422664 in words is "eighty-one million, four hundred twenty-two thousand, six hundred sixty-four".