81299576 has 32 divisors (see below), whose sum is σ = 161825040. Its totient is φ = 38158848.

The previous prime is 81299573. The next prime is 81299587. The reversal of 81299576 is 67599218.

It is a self number, because there is not a number n which added to its sum of digits gives 81299576.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81299573) 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 in 7 ways as a sum of consecutive naturals, for example, 91631 + ... + 92513.

Almost surely, 2^81299576 is an apocalyptic number.

It is an amenable number.

81299576 is a deficient number, since it is larger than the sum of its proper divisors (80525464).

81299576 is a wasteful number, since it uses less digits than its factorization.

81299576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583 (or 1579 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 81299576 is about 9016.6277509943. The cubic root of 81299576 is about 433.2076263902.

The spelling of 81299576 in words is "eighty-one million, two hundred ninety-nine thousand, five hundred seventy-six".