646633394 has 16 divisors (see below), whose sum is σ = 1058646240. Its totient is φ = 293780160.

The previous prime is 646633319. The next prime is 646633397. The reversal of 646633394 is 493336646.

It is not an unprimeable number, because it can be changed into a prime (646633397) 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, 48122 + ... + 60074.

It is an arithmetic number, because the mean of its divisors is an integer number (66165390).

Almost surely, 2^646633394 is an apocalyptic number.

646633394 is a deficient number, since it is larger than the sum of its proper divisors (412012846).

646633394 is a wasteful number, since it uses less digits than its factorization.

646633394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425.

The product of its digits is 839808, while the sum is 44.

The square root of 646633394 is about 25428.9872783011. The cubic root of 646633394 is about 864.7409847402.

The spelling of 646633394 in words is "six hundred forty-six million, six hundred thirty-three thousand, three hundred ninety-four".