646885670 has 32 divisors (see below), whose sum is σ = 1204136928. Its totient is φ = 250069248.

The previous prime is 646885669. The next prime is 646885739. The reversal of 646885670 is 76588646.

It is a happy number.

It is a super-2 number, since 2×646885670² = 836922140102697800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26402 + ... + 44618.

It is an arithmetic number, because the mean of its divisors is an integer number (37629279).

Almost surely, 2^646885670 is an apocalyptic number.

646885670 is a deficient number, since it is larger than the sum of its proper divisors (557251258).

646885670 is a wasteful number, since it uses less digits than its factorization.

646885670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18344.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 646885670 is about 25433.9471966111. The cubic root of 646885670 is about 864.8534261095.

The spelling of 646885670 in words is "six hundred forty-six million, eight hundred eighty-five thousand, six hundred seventy".