643754 has 8 divisors (see below), whose sum is σ = 974820. Its totient is φ = 318816.

The previous prime is 643751. The next prime is 643781. The reversal of 643754 is 457346.

643754 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 597529 + 46225 = 773^2 + 215^2 .

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 (643751) 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, 1259 + ... + 1694.

2⁶⁴³⁷⁵⁴ is an apocalyptic number.

643754 is a deficient number, since it is larger than the sum of its proper divisors (331066).

643754 is a wasteful number, since it uses less digits than its factorization.

643754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064.

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

The square root of 643754 is about 802.3428194980. The cubic root of 643754 is about 86.3455539747.

The spelling of 643754 in words is "six hundred forty-three thousand, seven hundred fifty-four".