28889785 has 16 divisors (see below), whose sum is σ = 37483200. Its totient is φ = 21301056.

The previous prime is 28889779. The next prime is 28889803. The reversal of 28889785 is 58798882.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28889785 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595 + ... + 7624.

It is an arithmetic number, because the mean of its divisors is an integer number (2342700).

Almost surely, 2^28889785 is an apocalyptic number.

It is an amenable number.

28889785 is a deficient number, since it is larger than the sum of its proper divisors (8593415).

28889785 is a wasteful number, since it uses less digits than its factorization.

28889785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8280.

The product of its digits is 2580480, while the sum is 55.

The square root of 28889785 is about 5374.9218598971. The cubic root of 28889785 is about 306.8419753523.

The spelling of 28889785 in words is "twenty-eight million, eight hundred eighty-nine thousand, seven hundred eighty-five".