641787923 has 8 divisors (see below), whose sum is σ = 733718880. Its totient is φ = 549918720.

The previous prime is 641787917. The next prime is 641787959. The reversal of 641787923 is 329787146.

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

It is a cyclic number.

It is not a de Polignac number, because 641787923 - 2¹⁸ = 641525779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641757923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9533 + ... + 37073.

It is an arithmetic number, because the mean of its divisors is an integer number (91714860).

Almost surely, 2^641787923 is an apocalyptic number.

641787923 is a deficient number, since it is larger than the sum of its proper divisors (91930957).

641787923 is a wasteful number, since it uses less digits than its factorization.

641787923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30877.

The product of its digits is 508032, while the sum is 47.

The square root of 641787923 is about 25333.5335671911. The cubic root of 641787923 is about 862.5756222429.

The spelling of 641787923 in words is "six hundred forty-one million, seven hundred eighty-seven thousand, nine hundred twenty-three".