581904779820 has 384 divisors, whose sum is σ = 2053920540672. Its totient is φ = 119831961600.

The previous prime is 581904779809. The next prime is 581904779839. The reversal of 581904779820 is 28977409185.

It is a super-2 number, since 2×581904779820² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43624192 + ... + 43637528.

It is an arithmetic number, because the mean of its divisors is an integer number (5348751408).

Almost surely, 2^581904779820 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 581904779820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026960270336).

581904779820 is an abundant number, since it is smaller than the sum of its proper divisors (1472015760852).

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

581904779820 is a wasteful number, since it uses less digits than its factorization.

581904779820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561 (or 13559 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 581904779820 in words is "five hundred eighty-one billion, nine hundred four million, seven hundred seventy-nine thousand, eight hundred twenty".