641771336 has 8 divisors (see below), whose sum is σ = 1203321270. Its totient is φ = 320885664.

The previous prime is 641771311. The next prime is 641771357. The reversal of 641771336 is 633177146.

It can be written as a sum of positive squares in only one way, i.e., 432390436 + 209380900 = 20794^2 + 14470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×641771336² = 823740895422449792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641771336.

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, 40110701 + ... + 40110716.

Almost surely, 2^641771336 is an apocalyptic number.

It is an amenable number.

641771336 is a deficient number, since it is larger than the sum of its proper divisors (561549934).

641771336 is a wasteful number, since it uses less digits than its factorization.

641771336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80221423 (or 80221419 counting only the distinct ones).

The product of its digits is 63504, while the sum is 38.

The square root of 641771336 is about 25333.2061926634. The cubic root of 641771336 is about 862.5681910939.

The spelling of 641771336 in words is "six hundred forty-one million, seven hundred seventy-one thousand, three hundred thirty-six".