28689869 has 8 divisors (see below), whose sum is σ = 31358880. Its totient is φ = 26086896.

The previous prime is 28689851. The next prime is 28689889. The reversal of 28689869 is 96898682.

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-28689869 is a prime.

It is a super-2 number, since 2×28689869² = 1646217166474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28689839) 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, 15599 + ... + 17340.

It is an arithmetic number, because the mean of its divisors is an integer number (3919860).

Almost surely, 2^28689869 is an apocalyptic number.

It is an amenable number.

28689869 is a deficient number, since it is larger than the sum of its proper divisors (2669011).

28689869 is a wasteful number, since it uses less digits than its factorization.

28689869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33019.

The product of its digits is 2985984, while the sum is 56.

The square root of 28689869 is about 5356.2924677430. The cubic root of 28689869 is about 306.1325589399.

The spelling of 28689869 in words is "twenty-eight million, six hundred eighty-nine thousand, eight hundred sixty-nine".