641670 has 32 divisors (see below), whose sum is σ = 1566432. Its totient is φ = 168192.

The previous prime is 641639. The next prime is 641681. The reversal of 641670 is 76146.

It is a self number, because there is not a number n which added to its sum of digits gives 641670.

It is a congruent number.

It is an unprimeable number.

641670 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 15 ways as a sum of consecutive naturals, for example, 2044 + ... + 2336.

It is an arithmetic number, because the mean of its divisors is an integer number (48951).

2⁶⁴¹⁶⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783216).

641670 is an abundant number, since it is smaller than the sum of its proper divisors (924762).

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

641670 is a wasteful number, since it uses less digits than its factorization.

641670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 641670 is about 801.0430700031. The cubic root of 641670 is about 86.2522788728.

The spelling of 641670 in words is "six hundred forty-one thousand, six hundred seventy".