1443639664 has 20 divisors (see below), whose sum is σ = 2842907080. Its totient is φ = 709986240.

The previous prime is 1443639653. The next prime is 1443639679. The reversal of 1443639664 is 4669363441.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738594 + ... + 740545.

It is an arithmetic number, because the mean of its divisors is an integer number (142145354).

Almost surely, 2^1443639664 is an apocalyptic number.

It is an amenable number.

1443639664 is a deficient number, since it is larger than the sum of its proper divisors (1399267416).

1443639664 is a wasteful number, since it uses less digits than its factorization.

1443639664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479208 (or 1479202 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 46.

The square root of 1443639664 is about 37995.2584410213. The cubic root of 1443639664 is about 1130.1938383635.

The spelling of 1443639664 in words is "one billion, four hundred forty-three million, six hundred thirty-nine thousand, six hundred sixty-four".