623535 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 302240.

The previous prime is 623531. The next prime is 623537. The reversal of 623535 is 535326.

623535 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 623535 - 2² = 623531 is a prime.

623535 is strictly pandigital in base 7.

623535 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623531) 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 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 2054.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁶²³⁵³⁵ is an apocalyptic number.

623535 is a deficient number, since it is larger than the sum of its proper divisors (465105).

623535 is a wasteful number, since it uses less digits than its factorization.

623535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3798.

The product of its digits is 2700, while the sum is 24.

The square root of 623535 is about 789.6423240936. The cubic root of 623535 is about 85.4319420100.

Subtracting from 623535 its reverse (535326), we obtain a square (88209 = 297²).

The spelling of 623535 in words is "six hundred twenty-three thousand, five hundred thirty-five".