581412656 has 40 divisors (see below), whose sum is σ = 1237916304. Its totient is φ = 262338560.

The previous prime is 581412617. The next prime is 581412659. The reversal of 581412656 is 656214185.

581412656 = 149² + 150² + ... + 1204².

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (581412659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12056 + ... + 36168.

Almost surely, 2^581412656 is an apocalyptic number.

It is a pronic number, being equal to 24112×24113.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581412656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618958152).

581412656 is an abundant number, since it is smaller than the sum of its proper divisors (656503648).

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

581412656 is a wasteful number, since it uses less digits than its factorization.

581412656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24269 (or 24263 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 581412656 is about 24112.4999948160. The cubic root of 581412656 is about 834.6316067685.

The spelling of 581412656 in words is "five hundred eighty-one million, four hundred twelve thousand, six hundred fifty-six".