640623304430 has 32 divisors (see below), whose sum is σ = 1221187487616. Its totient is φ = 241129444864.

The previous prime is 640623304423. The next prime is 640623304439. The reversal of 640623304430 is 34403326046.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640623304439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530507 + ... + 1250073.

It is an arithmetic number, because the mean of its divisors is an integer number (38162108988).

Almost surely, 2^640623304430 is an apocalyptic number.

640623304430 is a deficient number, since it is larger than the sum of its proper divisors (580564183186).

640623304430 is a wasteful number, since it uses less digits than its factorization.

640623304430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724828.

The product of its (nonzero) digits is 124416, while the sum is 35.

The spelling of 640623304430 in words is "six hundred forty billion, six hundred twenty-three million, three hundred four thousand, four hundred thirty".