643475753 has 8 divisors (see below), whose sum is σ = 647571456. Its totient is φ = 639388000.

The previous prime is 643475699. The next prime is 643475797. The reversal of 643475753 is 357574346.

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 643475753 - 2²⁴ = 626698537 is a prime.

It is a super-2 number, since 2×643475753² = 828122089397834018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643475353) 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, 272528 + ... + 274878.

It is an arithmetic number, because the mean of its divisors is an integer number (80946432).

Almost surely, 2^643475753 is an apocalyptic number.

It is an amenable number.

643475753 is a deficient number, since it is larger than the sum of its proper divisors (4095703).

643475753 is a wasteful number, since it uses less digits than its factorization.

643475753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975.

The product of its digits is 1058400, while the sum is 44.

The square root of 643475753 is about 25366.8238650407. The cubic root of 643475753 is about 863.3311192713.

The spelling of 643475753 in words is "six hundred forty-three million, four hundred seventy-five thousand, seven hundred fifty-three".