50128813 has 6 divisors (see below), whose sum is σ = 58313166. Its totient is φ = 42967512.

The previous prime is 50128811. The next prime is 50128823. The reversal of 50128813 is 31882105.

It can be written as a sum of positive squares in only one way, i.e., 36156169 + 13972644 = 6013^2 + 3738^2 .

It is not a de Polignac number, because 50128813 - 2¹ = 50128811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50128811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511470 + ... + 511567.

It is an arithmetic number, because the mean of its divisors is an integer number (9718861).

Almost surely, 2^50128813 is an apocalyptic number.

It is an amenable number.

50128813 is a deficient number, since it is larger than the sum of its proper divisors (8184353).

50128813 is a wasteful number, since it uses less digits than its factorization.

50128813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023051 (or 1023044 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 50128813 is about 7080.1704075538. The cubic root of 50128813 is about 368.7192460036.

The spelling of 50128813 in words is "fifty million, one hundred twenty-eight thousand, eight hundred thirteen".