81322508 has 12 divisors (see below), whose sum is σ = 149804760. Its totient is φ = 38521152.

The previous prime is 81322499. The next prime is 81322531. The reversal of 81322508 is 80522318.

It is a super-2 number, since 2×81322508² = 13226700614820128, 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 in 3 ways as a sum of consecutive naturals, for example, 534941 + ... + 535092.

It is an arithmetic number, because the mean of its divisors is an integer number (12483730).

Almost surely, 2^81322508 is an apocalyptic number.

It is an amenable number.

81322508 is a deficient number, since it is larger than the sum of its proper divisors (68482252).

81322508 is a wasteful number, since it uses less digits than its factorization.

81322508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070056 (or 1070054 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81322508 is about 9017.8993119240. The cubic root of 81322508 is about 433.2483538818.

The spelling of 81322508 in words is "eighty-one million, three hundred twenty-two thousand, five hundred eight".