641723658 has 64 divisors (see below), whose sum is σ = 1368576000. Its totient is φ = 200249280.

The previous prime is 641723647. The next prime is 641723669. The reversal of 641723658 is 856327146.

It is an interprime number because it is at equal distance from previous prime (641723647) and next prime (641723669).

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 31 ways as a sum of consecutive naturals, for example, 1488703 + ... + 1489133.

It is an arithmetic number, because the mean of its divisors is an integer number (21384000).

Almost surely, 2^641723658 is an apocalyptic number.

641723658 is an abundant number, since it is smaller than the sum of its proper divisors (726852342).

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

641723658 is a wasteful number, since it uses less digits than its factorization.

641723658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its digits is 241920, while the sum is 42.

The square root of 641723658 is about 25332.2651573048. The cubic root of 641723658 is about 862.5468301395.

The spelling of 641723658 in words is "six hundred forty-one million, seven hundred twenty-three thousand, six hundred fifty-eight".