28069985 has 8 divisors (see below), whose sum is σ = 34187136. Its totient is φ = 22120560.

The previous prime is 28069981. The next prime is 28069997. The reversal of 28069985 is 58996082.

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

It is not a de Polignac number, because 28069985 - 2² = 28069981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28069981) 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, 41561 + ... + 42230.

It is an arithmetic number, because the mean of its divisors is an integer number (4273392).

Almost surely, 2^28069985 is an apocalyptic number.

It is an amenable number.

28069985 is a deficient number, since it is larger than the sum of its proper divisors (6117151).

28069985 is an equidigital number, since it uses as much as digits as its factorization.

28069985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83863.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 28069985 is about 5298.1114559813. Note that the first 3 decimals coincide. The cubic root of 28069985 is about 303.9116815521.

The spelling of 28069985 in words is "twenty-eight million, sixty-nine thousand, nine hundred eighty-five".