813881064 has 16 divisors (see below), whose sum is σ = 2034702720. Its totient is φ = 271293680.

The previous prime is 813881063. The next prime is 813881071. The reversal of 813881064 is 460188318.

It is not an unprimeable number, because it can be changed into a prime (813881063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16955832 + ... + 16955879.

It is an arithmetic number, because the mean of its divisors is an integer number (127168920).

Almost surely, 2^813881064 is an apocalyptic number.

It is an amenable number.

813881064 is an abundant number, since it is smaller than the sum of its proper divisors (1220821656).

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

813881064 is a wasteful number, since it uses less digits than its factorization.

813881064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33911720 (or 33911716 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 813881064 is about 28528.6008069095. The cubic root of 813881064 is about 933.6561911389.

The spelling of 813881064 in words is "eight hundred thirteen million, eight hundred eighty-one thousand, sixty-four".