641570 has 8 divisors (see below), whose sum is σ = 1154844. Its totient is φ = 256624.

The previous prime is 641551. The next prime is 641579. The reversal of 641570 is 75146.

It can be written as a sum of positive squares in 2 ways, for example, as 619369 + 22201 = 787^2 + 149^2 .

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

It is a super-2 number, since 2×641570² = 823224129800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641579) by changing a digit.

641570 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32069 + ... + 32088.

2⁶⁴¹⁵⁷⁰ is an apocalyptic number.

641570 is a deficient number, since it is larger than the sum of its proper divisors (513274).

641570 is a wasteful number, since it uses less digits than its factorization.

641570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64164.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 641570 is about 800.9806489548. The cubic root of 641570 is about 86.2477980254.

The spelling of 641570 in words is "six hundred forty-one thousand, five hundred seventy".