643597442 has 8 divisors (see below), whose sum is σ = 970248000. Its totient is φ = 320181444.

The previous prime is 643597439. The next prime is 643597483. The reversal of 643597442 is 244795346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 643597393 and 643597402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808142 + ... + 808937.

It is an arithmetic number, because the mean of its divisors is an integer number (121281000).

Almost surely, 2^643597442 is an apocalyptic number.

643597442 is a deficient number, since it is larger than the sum of its proper divisors (326650558).

643597442 is a wasteful number, since it uses less digits than its factorization.

643597442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617280.

The product of its digits is 725760, while the sum is 44.

The square root of 643597442 is about 25369.2223373126. Note that the first 3 decimals coincide. The cubic root of 643597442 is about 863.3855379386.

The spelling of 643597442 in words is "six hundred forty-three million, five hundred ninety-seven thousand, four hundred forty-two".