646434528 has 96 divisors (see below), whose sum is σ = 1727510400. Its totient is φ = 211631616.

The previous prime is 646434521. The next prime is 646434557. The reversal of 646434528 is 825434646.

646434528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 646434528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646434521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705443 + ... + 1705821.

It is an arithmetic number, because the mean of its divisors is an integer number (17994900).

Almost surely, 2^646434528 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 646434528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863755200).

646434528 is an abundant number, since it is smaller than the sum of its proper divisors (1081075872).

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

646434528 is a wasteful number, since it uses less digits than its factorization.

646434528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 656 counting only the distinct ones).

The product of its digits is 552960, while the sum is 42.

The square root of 646434528 is about 25425.0767550464. The cubic root of 646434528 is about 864.6523280071.

The spelling of 646434528 in words is "six hundred forty-six million, four hundred thirty-four thousand, five hundred twenty-eight".