50639987 has 4 divisors (see below), whose sum is σ = 50857560. Its totient is φ = 50422416.

The previous prime is 50639971. The next prime is 50640011. The reversal of 50639987 is 78993605.

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 50639987 - 2⁴ = 50639971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50639947) 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, 108437 + ... + 108902.

It is an arithmetic number, because the mean of its divisors is an integer number (12714390).

Almost surely, 2^50639987 is an apocalyptic number.

50639987 is a deficient number, since it is larger than the sum of its proper divisors (217573).

50639987 is a wasteful number, since it uses less digits than its factorization.

50639987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217572.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 50639987 is about 7116.1778364513. The cubic root of 50639987 is about 369.9683123581.

The spelling of 50639987 in words is "fifty million, six hundred thirty-nine thousand, nine hundred eighty-seven".