815432280 has 128 divisors (see below), whose sum is σ = 2641766400. Its totient is φ = 200166912.

The previous prime is 815432279. The next prime is 815432309. The reversal of 815432280 is 82234518.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1121277 + ... + 1122003.

It is an arithmetic number, because the mean of its divisors is an integer number (20638800).

Almost surely, 2^815432280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815432280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320883200).

815432280 is an abundant number, since it is smaller than the sum of its proper divisors (1826334120).

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

815432280 is a wasteful number, since it uses less digits than its factorization.

815432280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 815432280 is about 28555.7748975579. The cubic root of 815432280 is about 934.2489817930.

Adding to 815432280 its reverse (82234518), we get a palindrome (897666798).

The spelling of 815432280 in words is "eight hundred fifteen million, four hundred thirty-two thousand, two hundred eighty".