643040057 has 8 divisors (see below), whose sum is σ = 720458112. Its totient is φ = 568782000.

The previous prime is 643040039. The next prime is 643040077. The reversal of 643040057 is 750040346.

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

It is a cyclic number.

It is not a de Polignac number, because 643040057 - 2⁸ = 643039801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643040077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789569 + ... + 790382.

It is an arithmetic number, because the mean of its divisors is an integer number (90057264).

Almost surely, 2^643040057 is an apocalyptic number.

It is an amenable number.

643040057 is a deficient number, since it is larger than the sum of its proper divisors (77418055).

643040057 is a wasteful number, since it uses less digits than its factorization.

643040057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579999.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 643040057 is about 25358.2345008480. The cubic root of 643040057 is about 863.1362220835.

The spelling of 643040057 in words is "six hundred forty-three million, forty thousand, fifty-seven".