623135420 has 12 divisors (see below), whose sum is σ = 1308584424. Its totient is φ = 249254160.

The previous prime is 623135413. The next prime is 623135423. The reversal of 623135420 is 24531326.

It is a self number, because there is not a number n which added to its sum of digits gives 623135420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623135423) 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 3 ways as a sum of consecutive naturals, for example, 15578366 + ... + 15578405.

It is an arithmetic number, because the mean of its divisors is an integer number (109048702).

Almost surely, 2^623135420 is an apocalyptic number.

It is an amenable number.

623135420 is an abundant number, since it is smaller than the sum of its proper divisors (685449004).

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

623135420 is a wasteful number, since it uses less digits than its factorization.

623135420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31156780 (or 31156778 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 623135420 is about 24962.6805451658. The cubic root of 623135420 is about 854.1368899026.

Adding to 623135420 its reverse (24531326), we get a palindrome (647666746).

The spelling of 623135420 in words is "six hundred twenty-three million, one hundred thirty-five thousand, four hundred twenty".