623515420 has 72 divisors (see below), whose sum is σ = 1454058144. Its totient is φ = 224400000.

The previous prime is 623515393. The next prime is 623515421. The reversal of 623515420 is 24515326.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623515421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243145 + ... + 245695.

It is an arithmetic number, because the mean of its divisors is an integer number (20195252).

Almost surely, 2^623515420 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 623515420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727029072).

623515420 is an abundant number, since it is smaller than the sum of its proper divisors (830542724).

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

623515420 is a wasteful number, since it uses less digits than its factorization.

623515420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2670 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 623515420 is about 24970.2907472060. The cubic root of 623515420 is about 854.3104776725.

The spelling of 623515420 in words is "six hundred twenty-three million, five hundred fifteen thousand, four hundred twenty".