641659406 has 8 divisors (see below), whose sum is σ = 962720640. Its totient is φ = 320752528.

The previous prime is 641659387. The next prime is 641659429. The reversal of 641659406 is 604956146.

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, 27566 + ... + 45201.

It is an arithmetic number, because the mean of its divisors is an integer number (120340080).

Almost surely, 2^641659406 is an apocalyptic number.

641659406 is a deficient number, since it is larger than the sum of its proper divisors (321061234).

641659406 is a wasteful number, since it uses less digits than its factorization.

641659406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77178.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 641659406 is about 25330.9969405075. The cubic root of 641659406 is about 862.5180419386.

The spelling of 641659406 in words is "six hundred forty-one million, six hundred fifty-nine thousand, four hundred six".