623144520 has 384 divisors, whose sum is σ = 2365459200. Its totient is φ = 141115392.

The previous prime is 623144513. The next prime is 623144531. The reversal of 623144520 is 25441326.

623144520 is a `hidden beast` number, since 623 + 14 + 4 + 5 + 20 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2674324 + ... + 2674556.

It is an arithmetic number, because the mean of its divisors is an integer number (6160050).

Almost surely, 2^623144520 is an apocalyptic number.

623144520 is a gapful number since it is divisible by the number (60) 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 623144520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182729600).

623144520 is an abundant number, since it is smaller than the sum of its proper divisors (1742314680).

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

623144520 is a wasteful number, since it uses less digits than its factorization.

623144520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 623144520 is about 24962.8628165922. The cubic root of 623144520 is about 854.1410476975.

Adding to 623144520 its reverse (25441326), we get a palindrome (648585846).

The spelling of 623144520 in words is "six hundred twenty-three million, one hundred forty-four thousand, five hundred twenty".