581491872 has 120 divisors (see below), whose sum is σ = 1841808276. Its totient is φ = 178910208.

The previous prime is 581491871. The next prime is 581491873. The reversal of 581491872 is 278194185.

581491872 is a `hidden beast` number, since 5 + 81 + 491 + 87 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (581491871) and next prime (581491873).

It can be written as a sum of positive squares in 2 ways, for example, as 449609616 + 131882256 = 21204^2 + 11484^2 .

It is not an unprimeable number, because it can be changed into a prime (581491871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25068 + ... + 42324.

Almost surely, 2^581491872 is an apocalyptic number.

581491872 is a gapful number since it is divisible by the number (52) 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 581491872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (920904138).

581491872 is an abundant number, since it is smaller than the sum of its proper divisors (1260316404).

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

581491872 is a wasteful number, since it uses less digits than its factorization.

581491872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17292 (or 17275 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 581491872 is about 24114.1425723578. The cubic root of 581491872 is about 834.6695105271.

The spelling of 581491872 in words is "five hundred eighty-one million, four hundred ninety-one thousand, eight hundred seventy-two".