641855747 has 16 divisors (see below), whose sum is σ = 699320160. Its totient is φ = 589077216.

The previous prime is 641855677. The next prime is 641855759. The reversal of 641855747 is 747558146.

It is not a de Polignac number, because 641855747 - 2²⁸ = 373420291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641855447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432068 + ... + 433550.

It is an arithmetic number, because the mean of its divisors is an integer number (43707510).

Almost surely, 2^641855747 is an apocalyptic number.

641855747 is a deficient number, since it is larger than the sum of its proper divisors (57464413).

641855747 is a wasteful number, since it uses less digits than its factorization.

641855747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1693 counting only the distinct ones).

The product of its digits is 940800, while the sum is 47.

The square root of 641855747 is about 25334.8721528252. The cubic root of 641855747 is about 862.6060067703.

The spelling of 641855747 in words is "six hundred forty-one million, eight hundred fifty-five thousand, seven hundred forty-seven".