1144323620 has 72 divisors (see below), whose sum is σ = 2649439800. Its totient is φ = 414853120.

The previous prime is 1144323613. The next prime is 1144323643. The reversal of 1144323620 is 263234411.

It can be written as a sum of positive squares in 4 ways, for example, as 31967716 + 1112355904 = 5654^2 + 33352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1144323620.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1231316 + ... + 1232244.

It is an arithmetic number, because the mean of its divisors is an integer number (36797775).

Almost surely, 2^1144323620 is an apocalyptic number.

1144323620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1144323620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324719900).

1144323620 is an abundant number, since it is smaller than the sum of its proper divisors (1505116180).

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

1144323620 is a wasteful number, since it uses less digits than its factorization.

1144323620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1144323620 is about 33827.8527252322. The cubic root of 1144323620 is about 1045.9629166940.

The spelling of 1144323620 in words is "one billion, one hundred forty-four million, three hundred twenty-three thousand, six hundred twenty".