87128239 has 8 divisors (see below), whose sum is σ = 97367760. Its totient is φ = 77275200.

The previous prime is 87128233. The next prime is 87128263. The reversal of 87128239 is 93282178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87128239 is a prime.

It is a super-2 number, since 2×87128239² = 15182660062482242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87128233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96144 + ... + 97045.

It is an arithmetic number, because the mean of its divisors is an integer number (12170970).

Almost surely, 2^87128239 is an apocalyptic number.

87128239 is a deficient number, since it is larger than the sum of its proper divisors (10239521).

87128239 is a wasteful number, since it uses less digits than its factorization.

87128239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193241.

The product of its digits is 48384, while the sum is 40.

The square root of 87128239 is about 9334.2508537108. The cubic root of 87128239 is about 443.3223691235.

The spelling of 87128239 in words is "eighty-seven million, one hundred twenty-eight thousand, two hundred thirty-nine".