623405220 has 24 divisors (see below), whose sum is σ = 1745534784. Its totient is φ = 166241376.

The previous prime is 623405213. The next prime is 623405231. The reversal of 623405220 is 22504326.

It is an unprimeable number.

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, 5194984 + ... + 5195103.

It is an arithmetic number, because the mean of its divisors is an integer number (72730616).

Almost surely, 2^623405220 is an apocalyptic number.

623405220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

623405220 is an abundant number, since it is smaller than the sum of its proper divisors (1122129564).

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

623405220 is a wasteful number, since it uses less digits than its factorization.

623405220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390099 (or 10390097 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 623405220 is about 24968.0840274139. The cubic root of 623405220 is about 854.2601444818.

Adding to 623405220 its reverse (22504326), we get a palindrome (645909546).

The spelling of 623405220 in words is "six hundred twenty-three million, four hundred five thousand, two hundred twenty".