623144320 has 64 divisors (see below), whose sum is σ = 1517894640. Its totient is φ = 244541440.

The previous prime is 623144309. The next prime is 623144321. The reversal of 623144320 is 23441326.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623144321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24735 + ... + 43105.

Almost surely, 2^623144320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623144320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758947320).

623144320 is an abundant number, since it is smaller than the sum of its proper divisors (894750320).

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

623144320 is a wasteful number, since it uses less digits than its factorization.

623144320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18443 (or 18431 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 623144320 is about 24962.8588106411. The cubic root of 623144320 is about 854.1409563178.

Adding to 623144320 its reverse (23441326), we get a palindrome (646585646).

The spelling of 623144320 in words is "six hundred twenty-three million, one hundred forty-four thousand, three hundred twenty".