646071626 has 4 divisors (see below), whose sum is σ = 969107442. Its totient is φ = 323035812.

The previous prime is 646071581. The next prime is 646071631. The reversal of 646071626 is 626170646.

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., 627452401 + 18619225 = 25049^2 + 4315^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646071626.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161517905 + ... + 161517908.

Almost surely, 2^646071626 is an apocalyptic number.

646071626 is a deficient number, since it is larger than the sum of its proper divisors (323035816).

646071626 is a wasteful number, since it uses less digits than its factorization.

646071626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323035815.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 646071626 is about 25417.9390588616. The cubic root of 646071626 is about 864.4904952757.

The spelling of 646071626 in words is "six hundred forty-six million, seventy-one thousand, six hundred twenty-six".