643036536 has 32 divisors (see below), whose sum is σ = 1786213200. Its totient is φ = 214345440.

The previous prime is 643036529. The next prime is 643036567. The reversal of 643036536 is 635630346.

It is a happy number.

643036536 is a `hidden beast` number, since 64 + 30 + 36 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 643036536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488295 + ... + 1488726.

Almost surely, 2^643036536 is an apocalyptic number.

It is an amenable number.

643036536 is an abundant number, since it is smaller than the sum of its proper divisors (1143176664).

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

643036536 is a wasteful number, since it uses less digits than its factorization.

643036536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977036 (or 2977026 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The square root of 643036536 is about 25358.1650755728. The cubic root of 643036536 is about 863.1346466979.

The spelling of 643036536 in words is "six hundred forty-three million, thirty-six thousand, five hundred thirty-six".