643435488 has 240 divisors, whose sum is σ = 2028571776. Its totient is φ = 199584000.

The previous prime is 643435459. The next prime is 643435493. The reversal of 643435488 is 884534346.

643435488 is a `hidden beast` number, since 64 + 3 + 43 + 548 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2563363 + ... + 2563613.

Almost surely, 2^643435488 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 643435488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014285888).

643435488 is an abundant number, since it is smaller than the sum of its proper divisors (1385136288).

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

643435488 is a wasteful number, since it uses less digits than its factorization.

643435488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 322 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 643435488 is about 25366.0301978847. The cubic root of 643435488 is about 863.3131114690.

The spelling of 643435488 in words is "six hundred forty-three million, four hundred thirty-five thousand, four hundred eighty-eight".