82490813 has 4 divisors (see below), whose sum is σ = 84409248. Its totient is φ = 80572380.

The previous prime is 82490809. The next prime is 82490833. The reversal of 82490813 is 31809428.

It is a happy number.

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 82490813 - 2² = 82490809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82490833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959153 + ... + 959238.

It is an arithmetic number, because the mean of its divisors is an integer number (21102312).

Almost surely, 2^82490813 is an apocalyptic number.

It is an amenable number.

82490813 is a deficient number, since it is larger than the sum of its proper divisors (1918435).

82490813 is a wasteful number, since it uses less digits than its factorization.

82490813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918434.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 82490813 is about 9082.4453205070. The cubic root of 82490813 is about 435.3132248839.

The spelling of 82490813 in words is "eighty-two million, four hundred ninety thousand, eight hundred thirteen".