80020809 has 36 divisors (see below), whose sum is σ = 128035908. Its totient is φ = 48121920.

The previous prime is 80020793. The next prime is 80020813. The reversal of 80020809 is 90802008.

It can be written as a sum of positive squares in 2 ways, for example, as 65367225 + 14653584 = 8085^2 + 3828^2 .

It is not a de Polignac number, because 80020809 - 2⁴ = 80020793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80020909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 214347 + ... + 214719.

It is an arithmetic number, because the mean of its divisors is an integer number (3556553).

Almost surely, 2^80020809 is an apocalyptic number.

It is an amenable number.

80020809 is a deficient number, since it is larger than the sum of its proper divisors (48015099).

80020809 is a wasteful number, since it uses less digits than its factorization.

80020809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 80020809 is about 8945.4350928281. The cubic root of 80020809 is about 430.9242944605.

It can be divided in two parts, 800 and 20809, that added together give a square (21609 = 147²).

The spelling of 80020809 in words is "eighty million, twenty thousand, eight hundred nine".