81648422 has 16 divisors (see below), whose sum is σ = 124325280. Its totient is φ = 40210368.

The previous prime is 81648421. The next prime is 81648431. The reversal of 81648422 is 22484618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55703 + ... + 57149.

It is an arithmetic number, because the mean of its divisors is an integer number (7770330).

Almost surely, 2^81648422 is an apocalyptic number.

81648422 is a deficient number, since it is larger than the sum of its proper divisors (42676858).

81648422 is a wasteful number, since it uses less digits than its factorization.

81648422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

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

The square root of 81648422 is about 9035.9516377635. The cubic root of 81648422 is about 433.8263549636.

The spelling of 81648422 in words is "eighty-one million, six hundred forty-eight thousand, four hundred twenty-two".