811806436 has 24 divisors (see below), whose sum is σ = 1694206080. Its totient is φ = 332789952.

The previous prime is 811806433. The next prime is 811806439. The reversal of 811806436 is 634608118.

It is an interprime number because it is at equal distance from previous prime (811806433) and next prime (811806439).

It is a junction number, because it is equal to n+sod(n) for n = 811806395 and 811806404.

It is not an unprimeable number, because it can be changed into a prime (811806433) 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, 629641 + ... + 630928.

It is an arithmetic number, because the mean of its divisors is an integer number (70591920).

Almost surely, 2^811806436 is an apocalyptic number.

It is an amenable number.

811806436 is an abundant number, since it is smaller than the sum of its proper divisors (882399644).

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

811806436 is a wasteful number, since it uses less digits than its factorization.

811806436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260603 (or 1260601 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 811806436 is about 28492.2171127485. The cubic root of 811806436 is about 932.8622023003.

It can be divided in two parts, 81180 and 6436, that added together give a square (87616 = 296²).

The spelling of 811806436 in words is "eight hundred eleven million, eight hundred six thousand, four hundred thirty-six".