81422468 has 6 divisors (see below), whose sum is σ = 142489326. Its totient is φ = 40711232.

The previous prime is 81422449. The next prime is 81422491. The reversal of 81422468 is 86422418.

It can be written as a sum of positive squares in only one way, i.e., 62220544 + 19201924 = 7888^2 + 4382^2 .

It is a super-2 number, since 2×81422468² = 13259236590422048, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177805 + ... + 10177812.

It is an arithmetic number, because the mean of its divisors is an integer number (23748221).

Almost surely, 2^81422468 is an apocalyptic number.

It is an amenable number.

81422468 is a deficient number, since it is larger than the sum of its proper divisors (61066858).

81422468 is a wasteful number, since it uses less digits than its factorization.

81422468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20355621 (or 20355619 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 81422468 is about 9023.4399205624. The cubic root of 81422468 is about 433.4257946026.

The spelling of 81422468 in words is "eighty-one million, four hundred twenty-two thousand, four hundred sixty-eight".