643953074 has 8 divisors (see below), whose sum is σ = 984154860. Its totient is φ = 315901456.

The previous prime is 643953059. The next prime is 643953077. The reversal of 643953074 is 470359346.

643953074 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 607869025 + 36084049 = 24655^2 + 6007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (643953077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3037409 + ... + 3037620.

Almost surely, 2^643953074 is an apocalyptic number.

643953074 is a deficient number, since it is larger than the sum of its proper divisors (340201786).

643953074 is a wasteful number, since it uses less digits than its factorization.

643953074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075084.

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 643953074 is about 25376.2304923328. The cubic root of 643953074 is about 863.5445353532.

The spelling of 643953074 in words is "six hundred forty-three million, nine hundred fifty-three thousand, seventy-four".