646206376 has 8 divisors (see below), whose sum is σ = 1211636970. Its totient is φ = 323103184.

The previous prime is 646206373. The next prime is 646206401. The reversal of 646206376 is 673602646.

It can be written as a sum of positive squares in only one way, i.e., 502925476 + 143280900 = 22426^2 + 11970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (646206373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40387891 + ... + 40387906.

Almost surely, 2^646206376 is an apocalyptic number.

It is an amenable number.

646206376 is a deficient number, since it is larger than the sum of its proper divisors (565430594).

646206376 is a wasteful number, since it uses less digits than its factorization.

646206376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80775803 (or 80775799 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 646206376 is about 25420.5896076389. The cubic root of 646206376 is about 864.5505928417.

The spelling of 646206376 in words is "six hundred forty-six million, two hundred six thousand, three hundred seventy-six".