581481936 has 160 divisors (see below), whose sum is σ = 1959438080. Its totient is φ = 161616384.

The previous prime is 581481931. The next prime is 581481937. The reversal of 581481936 is 639184185.

581481936 is a `hidden beast` number, since 5 + 81 + 481 + 93 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 581481891 and 581481900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581481931) 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 31 ways as a sum of consecutive naturals, for example, 109290 + ... + 114486.

It is an arithmetic number, because the mean of its divisors is an integer number (12246488).

Almost surely, 2^581481936 is an apocalyptic number.

581481936 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581481936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979719040).

581481936 is an abundant number, since it is smaller than the sum of its proper divisors (1377956144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

581481936 is a wasteful number, since it uses less digits than its factorization.

581481936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258 (or 5246 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 581481936 is about 24113.9365512975. The cubic root of 581481936 is about 834.6647564776.

The spelling of 581481936 in words is "five hundred eighty-one million, four hundred eighty-one thousand, nine hundred thirty-six".