50891988 has 72 divisors (see below), whose sum is σ = 141571584. Its totient is φ = 14179200.

The previous prime is 50891969. The next prime is 50892041. The reversal of 50891988 is 88919805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23053 + ... + 25163.

It is an arithmetic number, because the mean of its divisors is an integer number (1966272).

Almost surely, 2^50891988 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 50891988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70785792).

50891988 is an abundant number, since it is smaller than the sum of its proper divisors (90679596).

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

50891988 is a wasteful number, since it uses less digits than its factorization.

50891988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 50891988 is about 7133.8620676321. The cubic root of 50891988 is about 370.5809912890.

The spelling of 50891988 in words is "fifty million, eight hundred ninety-one thousand, nine hundred eighty-eight".