800640565 has 8 divisors (see below), whose sum is σ = 991761408. Its totient is φ = 619850640.

The previous prime is 800640509. The next prime is 800640587. The reversal of 800640565 is 565046008.

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

It is not a de Polignac number, because 800640565 - 2²⁷ = 666422837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 800640565.

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, 2582557 + ... + 2582866.

It is an arithmetic number, because the mean of its divisors is an integer number (123970176).

Almost surely, 2^800640565 is an apocalyptic number.

It is an amenable number.

800640565 is a deficient number, since it is larger than the sum of its proper divisors (191120843).

800640565 is a wasteful number, since it uses less digits than its factorization.

800640565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165459.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 800640565 is about 28295.5926780126. The cubic root of 800640565 is about 928.5654705676.

The spelling of 800640565 in words is "eight hundred million, six hundred forty thousand, five hundred sixty-five".