28286988 has 12 divisors (see below), whose sum is σ = 66003000. Its totient is φ = 9428992.

The previous prime is 28286983. The next prime is 28287013. The reversal of 28286988 is 88968282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28286988² = 1600307380224288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28286988.

It is not an unprimeable number, because it can be changed into a prime (28286983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178613 + ... + 1178636.

It is an arithmetic number, because the mean of its divisors is an integer number (5500250).

Almost surely, 2^28286988 is an apocalyptic number.

It is an amenable number.

28286988 is an abundant number, since it is smaller than the sum of its proper divisors (37716012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28286988 is a wasteful number, since it uses less digits than its factorization.

28286988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357256 (or 2357254 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 28286988 is about 5318.5513065120. The cubic root of 28286988 is about 304.6928305866.

The spelling of 28286988 in words is "twenty-eight million, two hundred eighty-six thousand, nine hundred eighty-eight".