623642623 has 4 divisors (see below), whose sum is σ = 627126840. Its totient is φ = 620158408.

The previous prime is 623642599. The next prime is 623642639. The reversal of 623642623 is 326246326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623642623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623642693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741840 + ... + 1742197.

It is an arithmetic number, because the mean of its divisors is an integer number (156781710).

Almost surely, 2^623642623 is an apocalyptic number.

623642623 is a deficient number, since it is larger than the sum of its proper divisors (3484217).

623642623 is a wasteful number, since it uses less digits than its factorization.

623642623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484216.

The product of its digits is 62208, while the sum is 34.

The square root of 623642623 is about 24972.8377041937. The cubic root of 623642623 is about 854.3685695085.

Adding to 623642623 its reverse (326246326), we get a palindrome (949888949).

The spelling of 623642623 in words is "six hundred twenty-three million, six hundred forty-two thousand, six hundred twenty-three".