50138640 has 120 divisors (see below), whose sum is σ = 170614080. Its totient is φ = 13193472.

The previous prime is 50138633. The next prime is 50138653. The reversal of 50138640 is 4683105.

50138640 is a `hidden beast` number, since 5 + 0 + 13 + 8 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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, 59341 + ... + 60179.

It is an arithmetic number, because the mean of its divisors is an integer number (1421784).

Almost surely, 2^50138640 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 50138640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85307040).

50138640 is an abundant number, since it is smaller than the sum of its proper divisors (120475440).

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

50138640 is a wasteful number, since it uses less digits than its factorization.

50138640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 50138640 is about 7080.8643540178. The cubic root of 50138640 is about 368.7433383839.

The spelling of 50138640 in words is "fifty million, one hundred thirty-eight thousand, six hundred forty".