810797128 has 16 divisors (see below), whose sum is σ = 1526772780. Its totient is φ = 403657728.

The previous prime is 810797123. The next prime is 810797129. The reversal of 810797128 is 821797018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 779414724 + 31382404 = 27918^2 + 5602^2 .

It is not an unprimeable number, because it can be changed into a prime (810797123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215625 + ... + 219352.

Almost surely, 2^810797128 is an apocalyptic number.

It is an amenable number.

810797128 is a deficient number, since it is larger than the sum of its proper divisors (715975652).

810797128 is a wasteful number, since it uses less digits than its factorization.

810797128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435216 (or 435212 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 810797128 is about 28474.4996092995. The cubic root of 810797128 is about 932.4754369684.

The spelling of 810797128 in words is "eight hundred ten million, seven hundred ninety-seven thousand, one hundred twenty-eight".