811331040 has 96 divisors (see below), whose sum is σ = 2752305696. Its totient is φ = 199710720.

The previous prime is 811331029. The next prime is 811331041. The reversal of 811331040 is 40133118.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (21) 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 = 811330998 and 811331016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811331041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58771 + ... + 71250.

It is an arithmetic number, because the mean of its divisors is an integer number (28669851).

Almost surely, 2^811331040 is an apocalyptic number.

811331040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

811331040 is an abundant number, since it is smaller than the sum of its proper divisors (1940974656).

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

811331040 is a wasteful number, since it uses less digits than its factorization.

811331040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130052 (or 130044 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 811331040 is about 28483.8733321155. The cubic root of 811331040 is about 932.6800712177.

Adding to 811331040 its reverse (40133118), we get a palindrome (851464158).

The spelling of 811331040 in words is "eight hundred eleven million, three hundred thirty-one thousand, forty".