50891920 has 20 divisors (see below), whose sum is σ = 118323900. Its totient is φ = 20356736.

The previous prime is 50891887. The next prime is 50891921. The reversal of 50891920 is 2919805.

It can be written as a sum of positive squares in 2 ways, for example, as 22886656 + 28005264 = 4784^2 + 5292^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (50891921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317995 + ... + 318154.

It is an arithmetic number, because the mean of its divisors is an integer number (5916195).

Almost surely, 2^50891920 is an apocalyptic number.

It is an amenable number.

50891920 is an abundant number, since it is smaller than the sum of its proper divisors (67431980).

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

50891920 is a wasteful number, since it uses less digits than its factorization.

50891920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636162 (or 636156 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 50891920 is about 7133.8573016286. The cubic root of 50891920 is about 370.5808262367.

The spelling of 50891920 in words is "fifty million, eight hundred ninety-one thousand, nine hundred twenty".