581640673 has 18 divisors (see below), whose sum is σ = 625534182. Its totient is φ = 540743040.

The previous prime is 581640659. The next prime is 581640743. The reversal of 581640673 is 376046185.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 102556129 + 479084544 = 10127^2 + 21888^2 .

It is not a de Polignac number, because 581640673 - 2²⁹ = 44769761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581640623) 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 in 17 ways as a sum of consecutive naturals, for example, 1343065 + ... + 1343497.

It is an arithmetic number, because the mean of its divisors is an integer number (34751899).

Almost surely, 2^581640673 is an apocalyptic number.

It is an amenable number.

581640673 is a deficient number, since it is larger than the sum of its proper divisors (43893509).

581640673 is an equidigital number, since it uses as much as digits as its factorization.

581640673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 581640673 is about 24117.2277221077. The cubic root of 581640673 is about 834.7407004389.

The spelling of 581640673 in words is "five hundred eighty-one million, six hundred forty thousand, six hundred seventy-three".