815943216 has 80 divisors (see below), whose sum is σ = 2399489280. Its totient is φ = 236501760.

The previous prime is 815943211. The next prime is 815943223. The reversal of 815943216 is 612349518.

It is not an unprimeable number, because it can be changed into a prime (815943211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21451 + ... + 45738.

It is an arithmetic number, because the mean of its divisors is an integer number (29993616).

Almost surely, 2^815943216 is an apocalyptic number.

It is an amenable number.

815943216 is an abundant number, since it is smaller than the sum of its proper divisors (1583546064).

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

815943216 is a wasteful number, since it uses less digits than its factorization.

815943216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67234 (or 67228 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 815943216 is about 28564.7197780759. The cubic root of 815943216 is about 934.4440692275. Note that the first 3 decimals are identical.

The spelling of 815943216 in words is "eight hundred fifteen million, nine hundred forty-three thousand, two hundred sixteen".