815128413 has 8 divisors (see below), whose sum is σ = 1185641376. Its totient is φ = 494017200.

The previous prime is 815128403. The next prime is 815128423. The reversal of 815128413 is 314821518.

It is an interprime number because it is at equal distance from previous prime (815128403) and next prime (815128423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 815128413 - 2⁴ = 815128397 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 24700861 = 815128413 / (8 + 1 + 5 + 1 + 2 + 8 + 4 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815128403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12350398 + ... + 12350463.

It is an arithmetic number, because the mean of its divisors is an integer number (148205172).

Almost surely, 2^815128413 is an apocalyptic number.

It is an amenable number.

815128413 is a deficient number, since it is larger than the sum of its proper divisors (370512963).

815128413 is a wasteful number, since it uses less digits than its factorization.

815128413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24700875.

The product of its digits is 7680, while the sum is 33.

The square root of 815128413 is about 28550.4538142566. The cubic root of 815128413 is about 934.1329195470.

The spelling of 815128413 in words is "eight hundred fifteen million, one hundred twenty-eight thousand, four hundred thirteen".