646807143 has 24 divisors (see below), whose sum is σ = 925145728. Its totient is φ = 401844096.

The previous prime is 646807121. The next prime is 646807159. The reversal of 646807143 is 341708646.

It is not a de Polignac number, because 646807143 - 2⁵ = 646807111 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646807043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85680 + ... + 92922.

Almost surely, 2^646807143 is an apocalyptic number.

646807143 is a deficient number, since it is larger than the sum of its proper divisors (278338585).

646807143 is a wasteful number, since it uses less digits than its factorization.

646807143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7383 (or 7366 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 646807143 is about 25432.4034058915. The cubic root of 646807143 is about 864.8184291508.

The spelling of 646807143 in words is "six hundred forty-six million, eight hundred seven thousand, one hundred forty-three".