646966470 has 48 divisors (see below), whose sum is σ = 1591638480. Its totient is φ = 168303360.

The previous prime is 646966459. The next prime is 646966477. The reversal of 646966470 is 74669646.

It is a super-2 number, since 2×646966470² = 837131226608521800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646966477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44016 + ... + 56844.

It is an arithmetic number, because the mean of its divisors is an integer number (33159135).

Almost surely, 2^646966470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646966470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795819240).

646966470 is an abundant number, since it is smaller than the sum of its proper divisors (944672010).

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

646966470 is a wasteful number, since it uses less digits than its factorization.

646966470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12921 (or 12880 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 48.

The square root of 646966470 is about 25435.5355752538. The cubic root of 646966470 is about 864.8894331150.

The spelling of 646966470 in words is "six hundred forty-six million, nine hundred sixty-six thousand, four hundred seventy".