581432820 has 24 divisors (see below), whose sum is σ = 1628012064. Its totient is φ = 155048736.

The previous prime is 581432783. The next prime is 581432881. The reversal of 581432820 is 28234185.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4845214 + ... + 4845333.

It is an arithmetic number, because the mean of its divisors is an integer number (67833836).

Almost surely, 2^581432820 is an apocalyptic number.

It is an amenable number.

581432820 is an abundant number, since it is smaller than the sum of its proper divisors (1046579244).

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

581432820 is a wasteful number, since it uses less digits than its factorization.

581432820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9690559 (or 9690557 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 581432820 is about 24112.9181145709. The cubic root of 581432820 is about 834.6412552898.

The spelling of 581432820 in words is "five hundred eighty-one million, four hundred thirty-two thousand, eight hundred twenty".