641996 has 6 divisors (see below), whose sum is σ = 1123500. Its totient is φ = 320996.

The previous prime is 641981. The next prime is 642011. The reversal of 641996 is 699146.

It is an interprime number because it is at equal distance from previous prime (641981) and next prime (642011).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80246 + ... + 80253.

It is an arithmetic number, because the mean of its divisors is an integer number (187250).

2⁶⁴¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

641996 is a deficient number, since it is larger than the sum of its proper divisors (481504).

641996 is a wasteful number, since it uses less digits than its factorization.

641996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160503 (or 160501 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 641996 is about 801.2465288536. The cubic root of 641996 is about 86.2668832034.

The spelling of 641996 in words is "six hundred forty-one thousand, nine hundred ninety-six".