646044426 has 36 divisors (see below), whose sum is σ = 1449728982. Its totient is φ = 207917472.

The previous prime is 646044419. The next prime is 646044437. The reversal of 646044426 is 624440646.

It is a happy number.

646044426 is a `hidden beast` number, since 6 + 4 + 604 + 4 + 42 + 6 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 579605625 + 66438801 = 24075^2 + 8151^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6201 + ... + 36476.

Almost surely, 2^646044426 is an apocalyptic number.

646044426 is an abundant number, since it is smaller than the sum of its proper divisors (803684556).

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

646044426 is a wasteful number, since it uses less digits than its factorization.

646044426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42743 (or 42711 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 646044426 is about 25417.4039980483. The cubic root of 646044426 is about 864.4783632507.

The spelling of 646044426 in words is "six hundred forty-six million, forty-four thousand, four hundred twenty-six".