28988 has 6 divisors (see below), whose sum is σ = 50736. Its totient is φ = 14492.

The previous prime is 28979. The next prime is 29009. The reversal of 28988 is 88982.

It is a super-4 number, since 4×28988⁴ = 2824444217694290944, which contains 4444 as substring.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28988.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3620 + ... + 3627.

It is an arithmetic number, because the mean of its divisors is an integer number (8456).

2²⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

28988 is a deficient number, since it is larger than the sum of its proper divisors (21748).

28988 is a wasteful number, since it uses less digits than its factorization.

28988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251 (or 7249 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 28988 is about 170.2586268005. The cubic root of 28988 is about 30.7189299938.

The spelling of 28988 in words is "twenty-eight thousand, nine hundred eighty-eight".