646972968 has 32 divisors (see below), whose sum is σ = 1618056000. Its totient is φ = 215574528.

The previous prime is 646972967. The next prime is 646973011. The reversal of 646972968 is 869279646.

It is not an unprimeable number, because it can be changed into a prime (646972967) 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, 117133 + ... + 122531.

It is an arithmetic number, because the mean of its divisors is an integer number (50564250).

Almost surely, 2^646972968 is an apocalyptic number.

It is an amenable number.

646972968 is an abundant number, since it is smaller than the sum of its proper divisors (971083032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646972968 is a wasteful number, since it uses less digits than its factorization.

646972968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401 (or 10397 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 57.

The square root of 646972968 is about 25435.6633096131. The cubic root of 646972968 is about 864.8923286966.

The spelling of 646972968 in words is "six hundred forty-six million, nine hundred seventy-two thousand, nine hundred sixty-eight".