646026646 has 8 divisors (see below), whose sum is σ = 987323904. Its totient is φ = 316918680.

The previous prime is 646026643. The next prime is 646026659. The reversal of 646026646 is 646620646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 646026599 and 646026608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646026643) 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 in 3 ways as a sum of consecutive naturals, for example, 3047190 + ... + 3047401.

It is an arithmetic number, because the mean of its divisors is an integer number (123415488).

Almost surely, 2^646026646 is an apocalyptic number.

646026646 is a deficient number, since it is larger than the sum of its proper divisors (341297258).

646026646 is a wasteful number, since it uses less digits than its factorization.

646026646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6094646.

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

The square root of 646026646 is about 25417.0542352964. The cubic root of 646026646 is about 864.4704326473.

The spelling of 646026646 in words is "six hundred forty-six million, twenty-six thousand, six hundred forty-six".