643430275 has 12 divisors (see below), whose sum is σ = 802753432. Its totient is φ = 511583040.

The previous prime is 643430251. The next prime is 643430287. The reversal of 643430275 is 572034346.

It is not a de Polignac number, because 643430275 - 2⁵ = 643430243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643430275.

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 11 ways as a sum of consecutive naturals, for example, 74874 + ... + 83023.

Almost surely, 2^643430275 is an apocalyptic number.

643430275 is a deficient number, since it is larger than the sum of its proper divisors (159323157).

643430275 is a wasteful number, since it uses less digits than its factorization.

643430275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158070 (or 158065 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 643430275 is about 25365.9274421418. The cubic root of 643430275 is about 863.3107799928.

The spelling of 643430275 in words is "six hundred forty-three million, four hundred thirty thousand, two hundred seventy-five".