646971246 has 64 divisors (see below), whose sum is σ = 1470173760. Its totient is φ = 210833280.

The previous prime is 646971239. The next prime is 646971277. The reversal of 646971246 is 642179646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 648420 + ... + 649416.

It is an arithmetic number, because the mean of its divisors is an integer number (22971465).

Almost surely, 2^646971246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646971246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735086880).

646971246 is an abundant number, since it is smaller than the sum of its proper divisors (823202514).

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

646971246 is a wasteful number, since it uses less digits than its factorization.

646971246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1260 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 646971246 is about 25435.6294594807. The cubic root of 646971246 is about 864.8915613560.

The spelling of 646971246 in words is "six hundred forty-six million, nine hundred seventy-one thousand, two hundred forty-six".