800720520 has 32 divisors (see below), whose sum is σ = 2402161920. Its totient is φ = 213525440.

The previous prime is 800720513. The next prime is 800720527. The reversal of 800720520 is 25027008.

It is an interprime number because it is at equal distance from previous prime (800720513) and next prime (800720527).

It is a super-2 number, since 2×800720520² = 1282306702298140800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (800720527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336216 + ... + 3336455.

It is an arithmetic number, because the mean of its divisors is an integer number (75067560).

Almost surely, 2^800720520 is an apocalyptic number.

It is an amenable number.

800720520 is an abundant number, since it is smaller than the sum of its proper divisors (1601441400).

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

800720520 is a wasteful number, since it uses less digits than its factorization.

800720520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672685 (or 6672681 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 800720520 is about 28297.0054952817. The cubic root of 800720520 is about 928.5963795606.

Adding to 800720520 its reverse (25027008), we get a palindrome (825747528).

The spelling of 800720520 in words is "eight hundred million, seven hundred twenty thousand, five hundred twenty".