1144638544 has 40 divisors (see below), whose sum is σ = 2616324608. Its totient is φ = 474733440.

The previous prime is 1144638511. The next prime is 1144638559. The reversal of 1144638544 is 4458364411.

It is a junction number, because it is equal to n+sod(n) for n = 1144638497 and 1144638506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161367 + ... + 168310.

Almost surely, 2^1144638544 is an apocalyptic number.

1144638544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1144638544 is an abundant number, since it is smaller than the sum of its proper divisors (1471686064).

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

1144638544 is a wasteful number, since it uses less digits than its factorization.

1144638544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329723 (or 329717 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 1144638544 is about 33832.5072083049. The cubic root of 1144638544 is about 1046.0588594288.

The spelling of 1144638544 in words is "one billion, one hundred forty-four million, six hundred thirty-eight thousand, five hundred forty-four".