82673581 has 4 divisors (see below), whose sum is σ = 82692064. Its totient is φ = 82655100.

The previous prime is 82673551. The next prime is 82673593. The reversal of 82673581 is 18537628.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82673581 - 2⁷ = 82673453 is a prime.

It is a super-2 number, since 2×82673581² = 13669841990727122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82673501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2146 + ... + 13036.

It is an arithmetic number, because the mean of its divisors is an integer number (20673016).

Almost surely, 2^82673581 is an apocalyptic number.

It is an amenable number.

82673581 is a deficient number, since it is larger than the sum of its proper divisors (18483).

82673581 is a wasteful number, since it uses less digits than its factorization.

82673581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18482.

The product of its digits is 80640, while the sum is 40.

The square root of 82673581 is about 9092.5013610117. The cubic root of 82673581 is about 435.6344834486.

The spelling of 82673581 in words is "eighty-two million, six hundred seventy-three thousand, five hundred eighty-one".