641726747 has 4 divisors (see below), whose sum is σ = 641832360. Its totient is φ = 641621136.

The previous prime is 641726741. The next prime is 641726773. The reversal of 641726747 is 747627146.

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

It is a cyclic number.

It is not a de Polignac number, because 641726747 - 2²² = 637532443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641726698 and 641726707.

It is not an unprimeable number, because it can be changed into a prime (641726741) by changing a digit.

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, 43097 + ... + 56042.

It is an arithmetic number, because the mean of its divisors is an integer number (160458090).

Almost surely, 2^641726747 is an apocalyptic number.

641726747 is a deficient number, since it is larger than the sum of its proper divisors (105613).

641726747 is an equidigital number, since it uses as much as digits as its factorization.

641726747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105612.

The product of its digits is 395136, while the sum is 44.

The square root of 641726747 is about 25332.3261269075. The cubic root of 641726747 is about 862.5482141220.

The spelling of 641726747 in words is "six hundred forty-one million, seven hundred twenty-six thousand, seven hundred forty-seven".