144778644 has 48 divisors (see below), whose sum is σ = 376400640. Its totient is φ = 48124800.

The previous prime is 144778631. The next prime is 144778661. The reversal of 144778644 is 446877441.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 144778644.

It is a congruent number.

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, 41637 + ... + 44979.

It is an arithmetic number, because the mean of its divisors is an integer number (7841680).

Almost surely, 2^144778644 is an apocalyptic number.

It is an amenable number.

144778644 is an abundant number, since it is smaller than the sum of its proper divisors (231621996).

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

144778644 is a wasteful number, since it uses less digits than its factorization.

144778644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757 (or 3749 counting only the distinct ones).

The product of its digits is 602112, while the sum is 45.

The square root of 144778644 is about 12032.3997606463. The cubic root of 144778644 is about 525.0913147287.

The spelling of 144778644 in words is "one hundred forty-four million, seven hundred seventy-eight thousand, six hundred forty-four".