50815128 has 128 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 13118976.

The previous prime is 50815123. The next prime is 50815129. The reversal of 50815128 is 82151805.

It is a junction number, because it is equal to n+sod(n) for n = 50815095 and 50815104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50815123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115533 + ... + 115971.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^50815128 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 50815128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79833600).

50815128 is an abundant number, since it is smaller than the sum of its proper divisors (108852072).

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

50815128 is a wasteful number, since it uses less digits than its factorization.

50815128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 50815128 is about 7128.4730482762. The cubic root of 50815128 is about 370.3943397356.

The spelling of 50815128 in words is "fifty million, eight hundred fifteen thousand, one hundred twenty-eight".