811428728 has 32 divisors (see below), whose sum is σ = 1691066160. Its totient is φ = 361870080.

The previous prime is 811428721. The next prime is 811428733. The reversal of 811428728 is 827824118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811428721) 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, 82325 + ... + 91652.

Almost surely, 2^811428728 is an apocalyptic number.

811428728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

811428728 is an abundant number, since it is smaller than the sum of its proper divisors (879637432).

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

811428728 is a wasteful number, since it uses less digits than its factorization.

811428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174047 (or 174043 counting only the distinct ones).

The product of its digits is 57344, while the sum is 41.

The square root of 811428728 is about 28485.5880753759. The cubic root of 811428728 is about 932.7175027098.

The spelling of 811428728 in words is "eight hundred eleven million, four hundred twenty-eight thousand, seven hundred twenty-eight".