643245445 has 8 divisors (see below), whose sum is σ = 782766720. Its totient is φ = 507348240.

The previous prime is 643245419. The next prime is 643245451. The reversal of 643245445 is 544542346.

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

It is not a de Polignac number, because 643245445 - 2¹⁵ = 643212677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905625 + ... + 906334.

It is an arithmetic number, because the mean of its divisors is an integer number (97845840).

Almost surely, 2^643245445 is an apocalyptic number.

It is an amenable number.

643245445 is a deficient number, since it is larger than the sum of its proper divisors (139521275).

643245445 is a wasteful number, since it uses less digits than its factorization.

643245445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812035.

The product of its digits is 230400, while the sum is 37.

The square root of 643245445 is about 25362.2839074087. The cubic root of 643245445 is about 863.2281079879.

The spelling of 643245445 in words is "six hundred forty-three million, two hundred forty-five thousand, four hundred forty-five".