641560 has 32 divisors (see below), whose sum is σ = 1481040. Its totient is φ = 249984.

The previous prime is 641551. The next prime is 641579. The reversal of 641560 is 65146.

It is a congruent number.

It is an unprimeable number.

641560 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 7 ways as a sum of consecutive naturals, for example, 1534 + ... + 1906.

2⁶⁴¹⁵⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740520).

641560 is an abundant number, since it is smaller than the sum of its proper divisors (839480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641560 is a wasteful number, since it uses less digits than its factorization.

641560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 641560 is about 800.9744065824. The cubic root of 641560 is about 86.2473499151.

The spelling of 641560 in words is "six hundred forty-one thousand, five hundred sixty".