811835136 has 540 divisors, whose sum is σ = 3045053088. Its totient is φ = 213663744.

The previous prime is 811835131. The next prime is 811835159. The reversal of 811835136 is 631538118.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 811835136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811835131) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 17273065 + ... + 17273111.

Almost surely, 2^811835136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811835136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522526544).

811835136 is an abundant number, since it is smaller than the sum of its proper divisors (2233217952).

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

811835136 is a wasteful number, since it uses less digits than its factorization.

811835136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 76 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 811835136 is about 28492.7207546068. The cubic root of 811835136 is about 932.8731954092.

The spelling of 811835136 in words is "eight hundred eleven million, eight hundred thirty-five thousand, one hundred thirty-six".