641679494 has 8 divisors (see below), whose sum is σ = 971864400. Its totient is φ = 317724696.

The previous prime is 641679487. The next prime is 641679523. The reversal of 641679494 is 494976146.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557269 + ... + 1557680.

It is an arithmetic number, because the mean of its divisors is an integer number (121483050).

Almost surely, 2^641679494 is an apocalyptic number.

641679494 is a deficient number, since it is larger than the sum of its proper divisors (330184906).

641679494 is a wasteful number, since it uses less digits than its factorization.

641679494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115054.

The product of its digits is 1306368, while the sum is 50.

The square root of 641679494 is about 25331.3934476570. The cubic root of 641679494 is about 862.5270426024.

The spelling of 641679494 in words is "six hundred forty-one million, six hundred seventy-nine thousand, four hundred ninety-four".