641636403 has 8 divisors (see below), whose sum is σ = 900542400. Its totient is φ = 405244008.

The previous prime is 641636393. The next prime is 641636407. The reversal of 641636403 is 304636146.

641636403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 641636403 - 2⁸ = 641636147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641636407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5628333 + ... + 5628446.

It is an arithmetic number, because the mean of its divisors is an integer number (112567800).

Almost surely, 2^641636403 is an apocalyptic number.

641636403 is a deficient number, since it is larger than the sum of its proper divisors (258905997).

641636403 is a wasteful number, since it uses less digits than its factorization.

641636403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11256801.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 641636403 is about 25330.5428879841. The cubic root of 641636403 is about 862.5077349443.

The spelling of 641636403 in words is "six hundred forty-one million, six hundred thirty-six thousand, four hundred three".