813442499072 has 60 divisors (see below), whose sum is σ = 1890650790270. Its totient is φ = 348618203136.

The previous prime is 813442499069. The next prime is 813442499081. The reversal of 813442499072 is 270994244318.

It can be written as a sum of positive squares in only one way, i.e., 444536893696 + 368905605376 = 666736^2 + 607376^2 .

It is a super-2 number, since 2×813442499072² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16186697 + ... + 16236872.

Almost surely, 2^813442499072 is an apocalyptic number.

It is an amenable number.

813442499072 is an abundant number, since it is smaller than the sum of its proper divisors (1077208291198).

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

813442499072 is an equidigital number, since it uses as much as digits as its factorization.

813442499072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32423601 (or 32423578 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 813442499072 in words is "eight hundred thirteen billion, four hundred forty-two million, four hundred ninety-nine thousand, seventy-two".