640308467 has 2 divisors, whose sum is σ = 640308468. Its totient is φ = 640308466.

The previous prime is 640308457. The next prime is 640308497. The reversal of 640308467 is 764803046.

It is a happy number.

640308467 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640308467 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640308467.

It is not a weakly prime, because it can be changed into another prime (640308457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320154233 + 320154234.

It is an arithmetic number, because the mean of its divisors is an integer number (320154234).

Almost surely, 2^640308467 is an apocalyptic number.

640308467 is a deficient number, since it is larger than the sum of its proper divisors (1).

640308467 is an equidigital number, since it uses as much as digits as its factorization.

640308467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 640308467 is about 25304.3171613067. The cubic root of 640308467 is about 861.9123062761.

The spelling of 640308467 in words is "six hundred forty million, three hundred eight thousand, four hundred sixty-seven".