81447022 has 16 divisors (see below), whose sum is σ = 128530800. Its totient is φ = 38651200.

The previous prime is 81447019. The next prime is 81447029. The reversal of 81447022 is 22074418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81447029) 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, 8479 + ... + 15322.

It is an arithmetic number, because the mean of its divisors is an integer number (8033175).

Almost surely, 2^81447022 is an apocalyptic number.

81447022 is a deficient number, since it is larger than the sum of its proper divisors (47083778).

81447022 is a wasteful number, since it uses less digits than its factorization.

81447022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23891.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 81447022 is about 9024.8003856041. The cubic root of 81447022 is about 433.4693586115.

The spelling of 81447022 in words is "eighty-one million, four hundred forty-seven thousand, twenty-two".