643465794 has 32 divisors (see below), whose sum is σ = 1296282240. Its totient is φ = 212936832.

The previous prime is 643465769. The next prime is 643465807. The reversal of 643465794 is 497564346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644904 + ... + 645900.

It is an arithmetic number, because the mean of its divisors is an integer number (40508820).

Almost surely, 2^643465794 is an apocalyptic number.

643465794 is an abundant number, since it is smaller than the sum of its proper divisors (652816446).

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

643465794 is a wasteful number, since it uses less digits than its factorization.

643465794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674.

The product of its digits is 2177280, while the sum is 48.

The square root of 643465794 is about 25366.6275645778. The cubic root of 643465794 is about 863.3266653563.

The spelling of 643465794 in words is "six hundred forty-three million, four hundred sixty-five thousand, seven hundred ninety-four".