641676478 has 8 divisors (see below), whose sum is σ = 966509280. Its totient is φ = 319506720.

The previous prime is 641676467. The next prime is 641676499. The reversal of 641676478 is 874676146.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665158 + ... + 666121.

It is an arithmetic number, because the mean of its divisors is an integer number (120813660).

Almost surely, 2^641676478 is an apocalyptic number.

641676478 is a deficient number, since it is larger than the sum of its proper divisors (324832802).

641676478 is a wasteful number, since it uses less digits than its factorization.

641676478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331522.

The product of its digits is 1354752, while the sum is 49.

The square root of 641676478 is about 25331.3339167127. Note that the first 3 decimals coincide. The cubic root of 641676478 is about 862.5256912602.

The spelling of 641676478 in words is "six hundred forty-one million, six hundred seventy-six thousand, four hundred seventy-eight".