641916236 has 12 divisors (see below), whose sum is σ = 1209765312. Its totient is φ = 296269008.

The previous prime is 641916217. The next prime is 641916259. The reversal of 641916236 is 632619146.

It is a self number, because there is not a number n which added to its sum of digits gives 641916236.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6172220 + ... + 6172323.

It is an arithmetic number, because the mean of its divisors is an integer number (100813776).

Almost surely, 2^641916236 is an apocalyptic number.

It is an amenable number.

641916236 is a deficient number, since it is larger than the sum of its proper divisors (567849076).

641916236 is a wasteful number, since it uses less digits than its factorization.

641916236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12344560 (or 12344558 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 641916236 is about 25336.0659140286. The cubic root of 641916236 is about 862.6331034796.

The spelling of 641916236 in words is "six hundred forty-one million, nine hundred sixteen thousand, two hundred thirty-six".