815104140 has 48 divisors (see below), whose sum is σ = 2314448640. Its totient is φ = 214298560.

The previous prime is 815104099. The next prime is 815104159. The reversal of 815104140 is 41401518.

It is a self number, because there is not a number n which added to its sum of digits gives 815104140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91410 + ... + 99929.

It is an arithmetic number, because the mean of its divisors is an integer number (48217680).

Almost surely, 2^815104140 is an apocalyptic number.

It is an amenable number.

815104140 is an abundant number, since it is smaller than the sum of its proper divisors (1499344500).

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

815104140 is a wasteful number, since it uses less digits than its factorization.

815104140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191422 (or 191420 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 815104140 is about 28550.0287215267. The cubic root of 815104140 is about 934.1236472111.

Adding to 815104140 its reverse (41401518), we get a palindrome (856505658).

The spelling of 815104140 in words is "eight hundred fifteen million, one hundred four thousand, one hundred forty".