641816 has 32 divisors (see below), whose sum is σ = 1403040. Its totient is φ = 269568.

The previous prime is 641813. The next prime is 641819. The reversal of 641816 is 618146.

It is an interprime number because it is at equal distance from previous prime (641813) and next prime (641819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641813) 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, 4010 + ... + 4166.

It is an arithmetic number, because the mean of its divisors is an integer number (43845).

2⁶⁴¹⁸¹⁶ 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 641816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701520).

641816 is an abundant number, since it is smaller than the sum of its proper divisors (761224).

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

641816 is a wasteful number, since it uses less digits than its factorization.

641816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 239 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 641816 is about 801.1341959996. The cubic root of 641816 is about 86.2588200740.

The spelling of 641816 in words is "six hundred forty-one thousand, eight hundred sixteen".