646964047 has 8 divisors (see below), whose sum is σ = 651839552. Its totient is φ = 642103200.

The previous prime is 646964039. The next prime is 646964077. The reversal of 646964047 is 740469646.

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

It is a cyclic number.

It is not a de Polignac number, because 646964047 - 2³ = 646964039 is a prime.

It is a super-2 number, since 2×646964047² = 837124956221236418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646963988 and 646964006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646964027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94618 + ... + 101224.

It is an arithmetic number, because the mean of its divisors is an integer number (81479944).

Almost surely, 2^646964047 is an apocalyptic number.

646964047 is a deficient number, since it is larger than the sum of its proper divisors (4875505).

646964047 is a wasteful number, since it uses less digits than its factorization.

646964047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7329.

The product of its (nonzero) digits is 870912, while the sum is 46.

The square root of 646964047 is about 25435.4879449953. The cubic root of 646964047 is about 864.8883533941. Note that the first 3 decimals are identical.

The spelling of 646964047 in words is "six hundred forty-six million, nine hundred sixty-four thousand, forty-seven".