50128987 has 4 divisors (see below), whose sum is σ = 50145480. Its totient is φ = 50112496.

The previous prime is 50128979. The next prime is 50128993. The reversal of 50128987 is 78982105.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 50128987 - 2³ = 50128979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50128997) 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, 2218 + ... + 10255.

It is an arithmetic number, because the mean of its divisors is an integer number (12536370).

Almost surely, 2^50128987 is an apocalyptic number.

50128987 is a deficient number, since it is larger than the sum of its proper divisors (16493).

50128987 is a wasteful number, since it uses less digits than its factorization.

50128987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16492.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 50128987 is about 7080.1826953829. The cubic root of 50128987 is about 368.7196726183.

It can be divided in two parts, 50128 and 987, that added together give a palindrome (51115).

The spelling of 50128987 in words is "fifty million, one hundred twenty-eight thousand, nine hundred eighty-seven".