1440581668 has 6 divisors (see below), whose sum is σ = 2521017926. Its totient is φ = 720290832.

The previous prime is 1440581663. The next prime is 1440581671. The reversal of 1440581668 is 8661850441.

It can be written as a sum of positive squares in only one way, i.e., 1407150144 + 33431524 = 37512^2 + 5782^2 .

It is not an unprimeable number, because it can be changed into a prime (1440581663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180072705 + ... + 180072712.

Almost surely, 2^1440581668 is an apocalyptic number.

It is an amenable number.

1440581668 is a deficient number, since it is larger than the sum of its proper divisors (1080436258).

1440581668 is a wasteful number, since it uses less digits than its factorization.

1440581668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360145421 (or 360145419 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 1440581668 is about 37954.9952970620. The cubic root of 1440581668 is about 1129.3952615629.

The spelling of 1440581668 in words is "one billion, four hundred forty million, five hundred eighty-one thousand, six hundred sixty-eight".