641662722 has 80 divisors (see below), whose sum is σ = 1533451392. Its totient is φ = 199843200.

The previous prime is 641662711. The next prime is 641662783. The reversal of 641662722 is 227266146.

641662722 is a `hidden beast` number, since 6 + 4 + 1 + 6 + 627 + 22 = 666.

It is a super-3 number, since 3×641662722³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 415083 + ... + 416625.

Almost surely, 2^641662722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641662722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766725696).

641662722 is an abundant number, since it is smaller than the sum of its proper divisors (891788670).

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

641662722 is a wasteful number, since it uses less digits than its factorization.

641662722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1716 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 641662722 is about 25331.0623938279. The cubic root of 641662722 is about 862.5195277242.

The spelling of 641662722 in words is "six hundred forty-one million, six hundred sixty-two thousand, seven hundred twenty-two".