646484076 has 72 divisors (see below), whose sum is σ = 1872159744. Its totient is φ = 184260960.

The previous prime is 646484057. The next prime is 646484093. The reversal of 646484076 is 670484646.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108741 + ... + 114531.

Almost surely, 2^646484076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646484076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936079872).

646484076 is an abundant number, since it is smaller than the sum of its proper divisors (1225675668).

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

646484076 is a wasteful number, since it uses less digits than its factorization.

646484076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251 (or 6246 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The square root of 646484076 is about 25426.0511287144. The cubic root of 646484076 is about 864.6744187717.

The spelling of 646484076 in words is "six hundred forty-six million, four hundred eighty-four thousand, seventy-six".