811868532 has 12 divisors (see below), whose sum is σ = 1894359936. Its totient is φ = 270622840.

The previous prime is 811868531. The next prime is 811868539. The reversal of 811868532 is 235868118.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811868531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33827844 + ... + 33827867.

It is an arithmetic number, because the mean of its divisors is an integer number (157863328).

Almost surely, 2^811868532 is an apocalyptic number.

It is an amenable number.

811868532 is an abundant number, since it is smaller than the sum of its proper divisors (1082491404).

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

811868532 is a wasteful number, since it uses less digits than its factorization.

811868532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67655718 (or 67655716 counting only the distinct ones).

The product of its digits is 92160, while the sum is 42.

The square root of 811868532 is about 28493.3067929997. The cubic root of 811868532 is about 932.8859869251.

The spelling of 811868532 in words is "eight hundred eleven million, eight hundred sixty-eight thousand, five hundred thirty-two".