645331430 has 16 divisors (see below), whose sum is σ = 1192991760. Its totient is φ = 251155872.

The previous prime is 645331417. The next prime is 645331469. The reversal of 645331430 is 34133546.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645331393 and 645331402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871700 + ... + 872439.

It is an arithmetic number, because the mean of its divisors is an integer number (74561985).

Almost surely, 2^645331430 is an apocalyptic number.

645331430 is a deficient number, since it is larger than the sum of its proper divisors (547660330).

645331430 is a wasteful number, since it uses less digits than its factorization.

645331430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744183.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 645331430 is about 25403.3743821564. The cubic root of 645331430 is about 864.1602238792.

Adding to 645331430 its reverse (34133546), we get a palindrome (679464976).

The spelling of 645331430 in words is "six hundred forty-five million, three hundred thirty-one thousand, four hundred thirty".