641806973 has 8 divisors (see below), whose sum is σ = 671156928. Its totient is φ = 612577504.

The previous prime is 641806943. The next prime is 641806987. The reversal of 641806973 is 379608146.

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 641806973 - 2²⁸ = 373371517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641806903) 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, 19136 + ... + 40617.

It is an arithmetic number, because the mean of its divisors is an integer number (83894616).

Almost surely, 2^641806973 is an apocalyptic number.

It is an amenable number.

641806973 is a deficient number, since it is larger than the sum of its proper divisors (29349955).

641806973 is a wasteful number, since it uses less digits than its factorization.

641806973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60243.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 641806973 is about 25333.9095482715. The cubic root of 641806973 is about 862.5841566836.

The spelling of 641806973 in words is "six hundred forty-one million, eight hundred six thousand, nine hundred seventy-three".