87028 has 6 divisors (see below), whose sum is σ = 152306. Its totient is φ = 43512.

The previous prime is 87013. The next prime is 87037. The reversal of 87028 is 82078.

It can be written as a sum of positive squares in only one way, i.e., 85264 + 1764 = 292^2 + 42^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 86993 and 87011.

It is a congruent number.

It is an unprimeable number.

87028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875 + ... + 10882.

2⁸⁷⁰²⁸ is an apocalyptic number.

It is an amenable number.

87028 is a deficient number, since it is larger than the sum of its proper divisors (65278).

87028 is a wasteful number, since it uses less digits than its factorization.

87028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21761 (or 21759 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 87028 is about 295.0050847019. The cubic root of 87028 is about 44.3152293214.

Subtracting from 87028 its reverse (82078), we obtain a triangular number (4950 = T₉₉).

It can be divided in two parts, 870 and 28, that added together give a palindrome (898).

The spelling of 87028 in words is "eighty-seven thousand, twenty-eight".