581364812 has 72 divisors (see below), whose sum is σ = 1258286400. Its totient is φ = 233676576.

The previous prime is 581364811. The next prime is 581364853. The reversal of 581364812 is 218463185.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (581364811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397739 + ... + 399197.

It is an arithmetic number, because the mean of its divisors is an integer number (17476200).

Almost surely, 2^581364812 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 581364812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629143200).

581364812 is an abundant number, since it is smaller than the sum of its proper divisors (676921588).

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

581364812 is a wasteful number, since it uses less digits than its factorization.

581364812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1594 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 581364812 is about 24111.5078748717. The cubic root of 581364812 is about 834.6087124096.

The spelling of 581364812 in words is "five hundred eighty-one million, three hundred sixty-four thousand, eight hundred twelve".