581870640 has 160 divisors (see below), whose sum is σ = 1952375040. Its totient is φ = 142507008.

The previous prime is 581870617. The next prime is 581870677. The reversal of 581870640 is 46078185.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 882631 + ... + 883289.

It is an arithmetic number, because the mean of its divisors is an integer number (12202344).

Almost surely, 2^581870640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581870640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976187520).

581870640 is an abundant number, since it is smaller than the sum of its proper divisors (1370504400).

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

581870640 is a wasteful number, since it uses less digits than its factorization.

581870640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 581870640 is about 24121.9949423757. The cubic root of 581870640 is about 834.8506982033.

The spelling of 581870640 in words is "five hundred eighty-one million, eight hundred seventy thousand, six hundred forty".