87639287 has 4 divisors (see below), whose sum is σ = 87746856. Its totient is φ = 87531720.

The previous prime is 87639281. The next prime is 87639323. The reversal of 87639287 is 78293678.

It is a happy number.

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 87639287 - 2¹⁰ = 87638263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639281) 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, 52553 + ... + 54194.

It is an arithmetic number, because the mean of its divisors is an integer number (21936714).

Almost surely, 2^87639287 is an apocalyptic number.

87639287 is a deficient number, since it is larger than the sum of its proper divisors (107569).

87639287 is a wasteful number, since it uses less digits than its factorization.

87639287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107568.

The product of its digits is 1016064, while the sum is 50.

The square root of 87639287 is about 9361.5857096968. The cubic root of 87639287 is about 444.1874445273.

The spelling of 87639287 in words is "eighty-seven million, six hundred thirty-nine thousand, two hundred eighty-seven".