581668 has 6 divisors (see below), whose sum is σ = 1017926.
Its totient is φ = 290832.
The previous prime is 581663. The next prime is 581683. The reversal of 581668 is 866185.
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 580644 + 1024 = 762^2 + 32^2
It is an Ulam number.
It is not an unprimeable number, because it can be changed into a prime (581663) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72705 + ... + 72712.
2581668 is an apocalyptic number.
It is an amenable number.
581668 is a deficient number, since it is larger than the sum of its proper divisors (436258).
581668 is a wasteful number, since it uses less digits than its factorization.
581668 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 145421 (or 145419 counting only the distinct ones).
The product of its digits is 11520, while the sum is 34.
The square root of 581668 is about 762.6716200305.
The cubic root of 581668 is about 83.4753773001.
The spelling of 581668 in words is "five hundred eighty-one thousand, six hundred sixty-eight".