813939072 has 64 divisors (see below), whose sum is σ = 2165011200. Its totient is φ = 270938624.

The previous prime is 813939059. The next prime is 813939109. The reversal of 813939072 is 270939318.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 505693 + ... + 507299.

It is an arithmetic number, because the mean of its divisors is an integer number (33828300).

Almost surely, 2^813939072 is an apocalyptic number.

It is an amenable number.

813939072 is an abundant number, since it is smaller than the sum of its proper divisors (1351072128).

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

813939072 is a wasteful number, since it uses less digits than its factorization.

813939072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943 (or 2931 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 813939072 is about 28529.6174527455. The cubic root of 813939072 is about 933.6783722020.

The spelling of 813939072 in words is "eight hundred thirteen million, nine hundred thirty-nine thousand, seventy-two".