640570 has 16 divisors (see below), whose sum is σ = 1317888. Its totient is φ = 219600.

The previous prime is 640531. The next prime is 640579. The reversal of 640570 is 75046.

640570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (640579) 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, 4506 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (82368).

2⁶⁴⁰⁵⁷⁰ is an apocalyptic number.

640570 is an abundant number, since it is smaller than the sum of its proper divisors (677318).

It is a weird number, because it is abundant, but not a pseudoperfect number.

640570 is a wasteful number, since it uses less digits than its factorization.

640570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9165.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 640570 is about 800.3561707140. The cubic root of 640570 is about 86.2029639218.

The spelling of 640570 in words is "six hundred forty thousand, five hundred seventy".