645104424 has 16 divisors (see below), whose sum is σ = 1612761120. Its totient is φ = 215034800.

The previous prime is 645104419. The next prime is 645104429. The reversal of 645104424 is 424401546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645104419) and next prime (645104429).

It is a junction number, because it is equal to n+sod(n) for n = 645104391 and 645104400.

It is not an unprimeable number, because it can be changed into a prime (645104429) 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, 13439652 + ... + 13439699.

It is an arithmetic number, because the mean of its divisors is an integer number (100797570).

Almost surely, 2^645104424 is an apocalyptic number.

It is an amenable number.

645104424 is an abundant number, since it is smaller than the sum of its proper divisors (967656696).

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

645104424 is a wasteful number, since it uses less digits than its factorization.

645104424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26879360 (or 26879356 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 645104424 is about 25398.9059606905. The cubic root of 645104424 is about 864.0588844470.

The spelling of 645104424 in words is "six hundred forty-five million, one hundred four thousand, four hundred twenty-four".