643070 has 16 divisors (see below), whose sum is σ = 1170288. Its totient is φ = 254400.

The previous prime is 643061. The next prime is 643073. The reversal of 643070 is 70346.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643070.

It is not an unprimeable number, because it can be changed into a prime (643073) 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, 770 + ... + 1370.

It is an arithmetic number, because the mean of its divisors is an integer number (73143).

2⁶⁴³⁰⁷⁰ is an apocalyptic number.

643070 is a deficient number, since it is larger than the sum of its proper divisors (527218).

643070 is a wasteful number, since it uses less digits than its factorization.

643070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 643070 is about 801.9164545013. The cubic root of 643070 is about 86.3149619117.

The spelling of 643070 in words is "six hundred forty-three thousand, seventy".