643453077 has 32 divisors (see below), whose sum is σ = 931682304. Its totient is φ = 393465600.

The previous prime is 643453061. The next prime is 643453087. The reversal of 643453077 is 770354346.

It is not a de Polignac number, because 643453077 - 2⁴ = 643453061 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643453087) 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 31 ways as a sum of consecutive naturals, for example, 793002 + ... + 793812.

It is an arithmetic number, because the mean of its divisors is an integer number (29115072).

Almost surely, 2^643453077 is an apocalyptic number.

It is an amenable number.

643453077 is a deficient number, since it is larger than the sum of its proper divisors (288229227).

643453077 is a wasteful number, since it uses less digits than its factorization.

643453077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209.

The product of its (nonzero) digits is 211680, while the sum is 39.

The square root of 643453077 is about 25366.3768993524. The cubic root of 643453077 is about 863.3209779276.

The spelling of 643453077 in words is "six hundred forty-three million, four hundred fifty-three thousand, seventy-seven".