816323580 has 72 divisors (see below), whose sum is σ = 2478621600. Its totient is φ = 217471872.

The previous prime is 816323549. The next prime is 816323597. The reversal of 816323580 is 85323618.

816323580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279166 + ... + 282074.

It is an arithmetic number, because the mean of its divisors is an integer number (34425300).

Almost surely, 2^816323580 is an apocalyptic number.

It is an amenable number.

816323580 is an abundant number, since it is smaller than the sum of its proper divisors (1662298020).

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

816323580 is a wasteful number, since it uses less digits than its factorization.

816323580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4483 (or 4478 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 816323580 is about 28571.3769356676. The cubic root of 816323580 is about 934.5892483126.

The spelling of 816323580 in words is "eight hundred sixteen million, three hundred twenty-three thousand, five hundred eighty".