813621324 has 24 divisors (see below), whose sum is σ = 1938843648. Its totient is φ = 265436560.

The previous prime is 813621317. The next prime is 813621337. The reversal of 813621324 is 423126318.

It is a junction number, because it is equal to n+sod(n) for n = 813621291 and 813621300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720732 + ... + 721859.

It is an arithmetic number, because the mean of its divisors is an integer number (80785152).

Almost surely, 2^813621324 is an apocalyptic number.

It is an amenable number.

813621324 is an abundant number, since it is smaller than the sum of its proper divisors (1125222324).

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

813621324 is a wasteful number, since it uses less digits than its factorization.

813621324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442645 (or 1442643 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 813621324 is about 28524.0481699215. The cubic root of 813621324 is about 933.5568589915.

The spelling of 813621324 in words is "eight hundred thirteen million, six hundred twenty-one thousand, three hundred twenty-four".