82581992 has 8 divisors (see below), whose sum is σ = 154841250. Its totient is φ = 41290992.

The previous prime is 82581991. The next prime is 82582009. The reversal of 82581992 is 29918528.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 3976036 = 8866^2 + 1994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (82581991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161367 + ... + 5161382.

Almost surely, 2^82581992 is an apocalyptic number.

It is an amenable number.

82581992 is a deficient number, since it is larger than the sum of its proper divisors (72259258).

82581992 is a wasteful number, since it uses less digits than its factorization.

82581992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322755 (or 10322751 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 82581992 is about 9087.4634524712. The cubic root of 82581992 is about 435.4735530793.

The spelling of 82581992 in words is "eighty-two million, five hundred eighty-one thousand, nine hundred ninety-two".