800643240 has 48 divisors (see below), whose sum is σ = 2602091700. Its totient is φ = 213504768.

The previous prime is 800643209. The next prime is 800643247. The reversal of 800643240 is 42346008.

It can be written as a sum of positive squares in 2 ways, for example, as 788823396 + 11819844 = 28086^2 + 3438^2 .

It is not an unprimeable number, because it can be changed into a prime (800643247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1111645 + ... + 1112364.

Almost surely, 2^800643240 is an apocalyptic number.

It is an amenable number.

800643240 is an abundant number, since it is smaller than the sum of its proper divisors (1801448460).

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

800643240 is a wasteful number, since it uses less digits than its factorization.

800643240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224026 (or 2224019 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 800643240 is about 28295.6399468187. The cubic root of 800643240 is about 928.5665047020.

Adding to 800643240 its reverse (42346008), we get a palindrome (842989248).

The spelling of 800643240 in words is "eight hundred million, six hundred forty-three thousand, two hundred forty".