641700 has 108 divisors (see below), whose sum is σ = 2166528. Its totient is φ = 158400.

The previous prime is 641681. The next prime is 641701. The reversal of 641700 is 7146.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (641701) by changing a digit.

641700 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 35 ways as a sum of consecutive naturals, for example, 20685 + ... + 20715.

2⁶⁴¹⁷⁰⁰ is an apocalyptic number.

641700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083264).

641700 is an abundant number, since it is smaller than the sum of its proper divisors (1524828).

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

641700 is a wasteful number, since it uses less digits than its factorization.

641700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 641700 is about 801.0617953691. The cubic root of 641700 is about 86.2536230362.

Adding to 641700 its reverse (7146), we get a palindrome (648846).

It can be divided in two parts, 64 and 1700, that added together give a square (1764 = 42²).

The spelling of 641700 in words is "six hundred forty-one thousand, seven hundred".