623643400 has 48 divisors (see below), whose sum is σ = 1453478400. Its totient is φ = 248854080.

The previous prime is 623643359. The next prime is 623643529. The reversal of 623643400 is 4346326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84249 + ... + 91351.

It is an arithmetic number, because the mean of its divisors is an integer number (30280800).

Almost surely, 2^623643400 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 623643400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726739200).

623643400 is an abundant number, since it is smaller than the sum of its proper divisors (829835000).

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

623643400 is a wasteful number, since it uses less digits than its factorization.

623643400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558 (or 7549 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 623643400 is about 24972.8532610913. The cubic root of 623643400 is about 854.3689243293.

Adding to 623643400 its reverse (4346326), we get a palindrome (627989726).

The spelling of 623643400 in words is "six hundred twenty-three million, six hundred forty-three thousand, four hundred".