28398985 has 8 divisors (see below), whose sum is σ = 34256520. Its totient is φ = 22600704.

The previous prime is 28398973. The next prime is 28398989. The reversal of 28398985 is 58989382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5253264 + 23145721 = 2292^2 + 4811^2 .

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-28398985 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28398989) 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, 13750 + ... + 15679.

It is an arithmetic number, because the mean of its divisors is an integer number (4282065).

Almost surely, 2^28398985 is an apocalyptic number.

It is an amenable number.

28398985 is a deficient number, since it is larger than the sum of its proper divisors (5857535).

28398985 is a wasteful number, since it uses less digits than its factorization.

28398985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29627.

The product of its digits is 1244160, while the sum is 52.

The square root of 28398985 is about 5329.0698062608. The cubic root of 28398985 is about 305.0944256592.

The spelling of 28398985 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred eighty-five".