643045026 has 32 divisors (see below), whose sum is σ = 1466494848. Its totient is φ = 186220800.

The previous prime is 643045021. The next prime is 643045033. The reversal of 643045026 is 620540346.

It is a junction number, because it is equal to n+sod(n) for n = 643044984 and 643045002.

It is not an unprimeable number, because it can be changed into a prime (643045021) 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, 241150 + ... + 243801.

It is an arithmetic number, because the mean of its divisors is an integer number (45827964).

Almost surely, 2^643045026 is an apocalyptic number.

643045026 is an abundant number, since it is smaller than the sum of its proper divisors (823449822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643045026 is a wasteful number, since it uses less digits than its factorization.

643045026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484986.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 643045026 is about 25358.3324767225. The cubic root of 643045026 is about 863.1384453317.

The spelling of 643045026 in words is "six hundred forty-three million, forty-five thousand, twenty-six".