815449180 has 72 divisors (see below), whose sum is σ = 2145292128. Its totient is φ = 258072192.

The previous prime is 815449177. The next prime is 815449189. The reversal of 815449180 is 81944518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815449189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19264 + ... + 44743.

It is an arithmetic number, because the mean of its divisors is an integer number (29795724).

Almost surely, 2^815449180 is an apocalyptic number.

It is an amenable number.

815449180 is an abundant number, since it is smaller than the sum of its proper divisors (1329842948).

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

815449180 is a wasteful number, since it uses less digits than its factorization.

815449180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64043 (or 64034 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 815449180 is about 28556.0708081487. The cubic root of 815449180 is about 934.2554359152.

The spelling of 815449180 in words is "eight hundred fifteen million, four hundred forty-nine thousand, one hundred eighty".