641443706 has 4 divisors (see below), whose sum is σ = 962165562. Its totient is φ = 320721852.

The previous prime is 641443697. The next prime is 641443763. The reversal of 641443706 is 607344146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 639634681 + 1809025 = 25291^2 + 1345^2 .

It is a super-2 number, since 2×641443706² = 822900055934028872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160360925 + ... + 160360928.

Almost surely, 2^641443706 is an apocalyptic number.

641443706 is a deficient number, since it is larger than the sum of its proper divisors (320721856).

641443706 is a wasteful number, since it uses less digits than its factorization.

641443706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320721855.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 641443706 is about 25326.7389531301. The cubic root of 641443706 is about 862.4213831865.

The spelling of 641443706 in words is "six hundred forty-one million, four hundred forty-three thousand, seven hundred six".