641708794 has 8 divisors (see below), whose sum is σ = 986040468. Its totient is φ = 313028640.

The previous prime is 641708783. The next prime is 641708801. The reversal of 641708794 is 497807146.

It can be written as a sum of positive squares in 2 ways, for example, as 406546569 + 235162225 = 20163^2 + 15335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3912777 + ... + 3912940.

Almost surely, 2^641708794 is an apocalyptic number.

641708794 is a deficient number, since it is larger than the sum of its proper divisors (344331674).

641708794 is a wasteful number, since it uses less digits than its factorization.

641708794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7825760.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 641708794 is about 25331.9717748145. The cubic root of 641708794 is about 862.5401704738.

The spelling of 641708794 in words is "six hundred forty-one million, seven hundred eight thousand, seven hundred ninety-four".