646867450 has 12 divisors (see below), whose sum is σ = 1203173550. Its totient is φ = 258746960.

The previous prime is 646867423. The next prime is 646867451. The reversal of 646867450 is 54768646.

It can be written as a sum of positive squares in 3 ways, for example, as 398521369 + 248346081 = 19963^2 + 15759^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646867450.

It is not an unprimeable number, because it can be changed into a prime (646867451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6468625 + ... + 6468724.

Almost surely, 2^646867450 is an apocalyptic number.

646867450 is a deficient number, since it is larger than the sum of its proper divisors (556306100).

646867450 is a wasteful number, since it uses less digits than its factorization.

646867450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12937361 (or 12937356 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The square root of 646867450 is about 25433.5890113841. The cubic root of 646867450 is about 864.8453062938.

The spelling of 646867450 in words is "six hundred forty-six million, eight hundred sixty-seven thousand, four hundred fifty".