643643092 has 48 divisors (see below), whose sum is σ = 1193113152. Its totient is φ = 303448320.

The previous prime is 643643089. The next prime is 643643093. The reversal of 643643092 is 290346346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643643093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754138 + ... + 754990.

It is an arithmetic number, because the mean of its divisors is an integer number (24856524).

Almost surely, 2^643643092 is an apocalyptic number.

It is an amenable number.

643643092 is a deficient number, since it is larger than the sum of its proper divisors (549470060).

643643092 is a wasteful number, since it uses less digits than its factorization.

643643092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 643643092 is about 25370.1220336048. The cubic root of 643643092 is about 863.4059506042.

The spelling of 643643092 in words is "six hundred forty-three million, six hundred forty-three thousand, ninety-two".