643565348 has 24 divisors (see below), whose sum is σ = 1154852160. Its totient is φ = 313639200.

The previous prime is 643565347. The next prime is 643565353. The reversal of 643565348 is 843565346.

It is a happy number.

It is a super-2 number, since 2×643565348² = 828352714292722208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643565299 and 643565308.

It is not an unprimeable number, because it can be changed into a prime (643565347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83873 + ... + 91223.

It is an arithmetic number, because the mean of its divisors is an integer number (48118840).

Almost surely, 2^643565348 is an apocalyptic number.

It is an amenable number.

643565348 is a deficient number, since it is larger than the sum of its proper divisors (511286812).

643565348 is a wasteful number, since it uses less digits than its factorization.

643565348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7907 (or 7905 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 44.

The square root of 643565348 is about 25368.5897913148. The cubic root of 643565348 is about 863.3711863402.

The spelling of 643565348 in words is "six hundred forty-three million, five hundred sixty-five thousand, three hundred forty-eight".