643164248 has 8 divisors (see below), whose sum is σ = 1205932980. Its totient is φ = 321582120.

The previous prime is 643164211. The next prime is 643164283. The reversal of 643164248 is 842461346.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40197758 + ... + 40197773.

Almost surely, 2^643164248 is an apocalyptic number.

It is an amenable number.

643164248 is a deficient number, since it is larger than the sum of its proper divisors (562768732).

643164248 is a wasteful number, since it uses less digits than its factorization.

643164248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80395537 (or 80395533 counting only the distinct ones).

The product of its digits is 110592, while the sum is 38.

The square root of 643164248 is about 25360.6831138280. The cubic root of 643164248 is about 863.1917846411.

The spelling of 643164248 in words is "six hundred forty-three million, one hundred sixty-four thousand, two hundred forty-eight".