646767646 has 8 divisors (see below), whose sum is σ = 1108744560. Its totient is φ = 277186128.

The previous prime is 646767637. The next prime is 646767673.

It is a happy number.

646767646 is nontrivially palindromic in base 10.

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 = 646767593 and 646767602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23098831 + ... + 23098858.

It is an arithmetic number, because the mean of its divisors is an integer number (138593070).

Almost surely, 2^646767646 is an apocalyptic number.

646767646 is a deficient number, since it is larger than the sum of its proper divisors (461976914).

646767646 is a wasteful number, since it uses less digits than its factorization.

646767646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46197698.

The product of its digits is 6096384, while the sum is 52.

The square root of 646767646 is about 25431.6268846490. The cubic root of 646767646 is about 864.8008255373.

The spelling of 646767646 in words is "six hundred forty-six million, seven hundred sixty-seven thousand, six hundred forty-six".