81449476 has 6 divisors (see below), whose sum is σ = 142536590. Its totient is φ = 40724736.

The previous prime is 81449437. The next prime is 81449479. The reversal of 81449476 is 67494418.

It can be written as a sum of positive squares in only one way, i.e., 81432576 + 16900 = 9024^2 + 130^2 .

It is not an unprimeable number, because it can be changed into a prime (81449479) by changing a digit.

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, 10181181 + ... + 10181188.

Almost surely, 2^81449476 is an apocalyptic number.

It is an amenable number.

81449476 is a deficient number, since it is larger than the sum of its proper divisors (61087114).

81449476 is a wasteful number, since it uses less digits than its factorization.

81449476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20362373 (or 20362371 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 81449476 is about 9024.9363432658. The cubic root of 81449476 is about 433.4737120472.

The spelling of 81449476 in words is "eighty-one million, four hundred forty-nine thousand, four hundred seventy-six".