646064626 has 4 divisors (see below), whose sum is σ = 969096942. Its totient is φ = 323032312.

The previous prime is 646064623. The next prime is 646064669. The reversal of 646064626 is 626460646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 443144601 + 202920025 = 21051^2 + 14245^2 .

It is not an unprimeable number, because it can be changed into a prime (646064623) by changing a digit.

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 as a sum of consecutive naturals, namely, 161516155 + ... + 161516158.

Almost surely, 2^646064626 is an apocalyptic number.

646064626 is a deficient number, since it is larger than the sum of its proper divisors (323032316).

646064626 is a wasteful number, since it uses less digits than its factorization.

646064626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323032315.

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 646064626 is about 25417.8013604639. The cubic root of 646064626 is about 864.4873730960.

The spelling of 646064626 in words is "six hundred forty-six million, sixty-four thousand, six hundred twenty-six".