646190928 has 120 divisors (see below), whose sum is σ = 1875336320. Its totient is φ = 207567360.

The previous prime is 646190917. The next prime is 646190933. The reversal of 646190928 is 829091646.

It is a happy number.

646190928 is a `hidden beast` number, since 6 + 4 + 619 + 0 + 9 + 28 = 666.

It is a congruent number.

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, 488508 + ... + 489828.

Almost surely, 2^646190928 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 646190928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937668160).

646190928 is an abundant number, since it is smaller than the sum of its proper divisors (1229145392).

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

646190928 is a wasteful number, since it uses less digits than its factorization.

646190928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 646190928 is about 25420.2857576385. The cubic root of 646190928 is about 864.5437035648.

The spelling of 646190928 in words is "six hundred forty-six million, one hundred ninety thousand, nine hundred twenty-eight".