581339616 has 384 divisors, whose sum is σ = 1975228416. Its totient is φ = 146964480.

The previous prime is 581339543. The next prime is 581339639. The reversal of 581339616 is 616933185.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10968646 + ... + 10968698.

It is an arithmetic number, because the mean of its divisors is an integer number (5143824).

Almost surely, 2^581339616 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 581339616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987614208).

581339616 is an abundant number, since it is smaller than the sum of its proper divisors (1393888800).

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

581339616 is a wasteful number, since it uses less digits than its factorization.

581339616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 146 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 581339616 is about 24110.9853801125. The cubic root of 581339616 is about 834.5966550895.

The spelling of 581339616 in words is "five hundred eighty-one million, three hundred thirty-nine thousand, six hundred sixteen".