810900128 has 12 divisors (see below), whose sum is σ = 1596459690. Its totient is φ = 405450048.

The previous prime is 810900127. The next prime is 810900131. The reversal of 810900128 is 821009018.

It can be written as a sum of positive squares in only one way, i.e., 585059344 + 225840784 = 24188^2 + 15028^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 810900128.

It is not an unprimeable number, because it can be changed into a prime (810900127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12670283 + ... + 12670346.

Almost surely, 2^810900128 is an apocalyptic number.

It is an amenable number.

810900128 is a deficient number, since it is larger than the sum of its proper divisors (785559562).

810900128 is a wasteful number, since it uses less digits than its factorization.

810900128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25340639 (or 25340631 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 810900128 is about 28476.3081876847. The cubic root of 810900128 is about 932.5149211172.

The spelling of 810900128 in words is "eight hundred ten million, nine hundred thousand, one hundred twenty-eight".