623916640 has 48 divisors (see below), whose sum is σ = 1483952400. Its totient is φ = 247882240.

The previous prime is 623916637. The next prime is 623916647. The reversal of 623916640 is 46619326.

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 623916640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623916647) 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, 10755 + ... + 36925.

It is an arithmetic number, because the mean of its divisors is an integer number (30915675).

Almost surely, 2^623916640 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 623916640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741976200).

623916640 is an abundant number, since it is smaller than the sum of its proper divisors (860035760).

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

623916640 is a wasteful number, since it uses less digits than its factorization.

623916640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26335 (or 26327 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 623916640 is about 24978.3234025024. The cubic root of 623916640 is about 854.4936824198.

The spelling of 623916640 in words is "six hundred twenty-three million, nine hundred sixteen thousand, six hundred forty".