643353028 has 12 divisors (see below), whose sum is σ = 1142672272. Its totient is φ = 316875240.

The previous prime is 643353019. The next prime is 643353037. The reversal of 643353028 is 820353346.

It is an interprime number because it is at equal distance from previous prime (643353019) and next prime (643353037).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 643352984 and 643353002.

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 3 ways as a sum of consecutive naturals, for example, 1200018 + ... + 1200553.

Almost surely, 2^643353028 is an apocalyptic number.

It is an amenable number.

643353028 is a deficient number, since it is larger than the sum of its proper divisors (499319244).

643353028 is a wasteful number, since it uses less digits than its factorization.

643353028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400642 (or 2400640 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 643353028 is about 25364.4047436560. The cubic root of 643353028 is about 863.2762303613.

The spelling of 643353028 in words is "six hundred forty-three million, three hundred fifty-three thousand, twenty-eight".