811820428 has 12 divisors (see below), whose sum is σ = 1420891360. Its totient is φ = 405851472.

The previous prime is 811820423. The next prime is 811820437. The reversal of 811820428 is 824028118.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 811820393 and 811820402.

It is not an unprimeable number, because it can be changed into a prime (811820423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35350 + ... + 53602.

Almost surely, 2^811820428 is an apocalyptic number.

It is an amenable number.

811820428 is a deficient number, since it is larger than the sum of its proper divisors (609070932).

811820428 is a wasteful number, since it uses less digits than its factorization.

811820428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29376 (or 29374 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 811820428 is about 28492.4626524279. The cubic root of 811820428 is about 932.8675617606.

The spelling of 811820428 in words is "eight hundred eleven million, eight hundred twenty thousand, four hundred twenty-eight".