1144663440 has 80 divisors (see below), whose sum is σ = 3631011648. Its totient is φ = 298142208.

The previous prime is 1144663439. The next prime is 1144663463. The reversal of 1144663440 is 443664411.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45139 + ... + 65778.

Almost surely, 2^1144663440 is an apocalyptic number.

1144663440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144663440 is an abundant number, since it is smaller than the sum of its proper divisors (2486348208).

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

1144663440 is a wasteful number, since it uses less digits than its factorization.

1144663440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110976 (or 110970 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 1144663440 is about 33832.8751364704. The cubic root of 1144663440 is about 1046.0664433346.

The spelling of 1144663440 in words is "one billion, one hundred forty-four million, six hundred sixty-three thousand, four hundred forty".