646834866 has 16 divisors (see below), whose sum is σ = 1294027488. Its totient is φ = 215552000.

The previous prime is 646834849. The next prime is 646834883. The reversal of 646834866 is 668438646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646834849) and next prime (646834883).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12466 + ... + 38066.

It is an arithmetic number, because the mean of its divisors is an integer number (80876718).

Almost surely, 2^646834866 is an apocalyptic number.

646834866 is an abundant number, since it is smaller than the sum of its proper divisors (647192622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646834866 is a wasteful number, since it uses less digits than its factorization.

646834866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29817.

The product of its digits is 3981312, while the sum is 51.

The square root of 646834866 is about 25432.9484330858. The cubic root of 646834866 is about 864.8307847239.

The spelling of 646834866 in words is "six hundred forty-six million, eight hundred thirty-four thousand, eight hundred sixty-six".