645104423 has 8 divisors (see below), whose sum is σ = 683665920. Its totient is φ = 606611200.

The previous prime is 645104419. The next prime is 645104429. The reversal of 645104423 is 324401546.

645104423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645104423 - 2² = 645104419 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 (645104429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3083 + ... + 36051.

It is an arithmetic number, because the mean of its divisors is an integer number (85458240).

Almost surely, 2^645104423 is an apocalyptic number.

645104423 is a deficient number, since it is larger than the sum of its proper divisors (38561497).

645104423 is a wasteful number, since it uses less digits than its factorization.

645104423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34137.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 645104423 is about 25398.9059410046. The cubic root of 645104423 is about 864.0588840005.

Adding to 645104423 its reverse (324401546), we get a palindrome (969505969).

The spelling of 645104423 in words is "six hundred forty-five million, one hundred four thousand, four hundred twenty-three".