28939689 has 12 divisors (see below), whose sum is σ = 41868736. Its totient is φ = 19262232.

The previous prime is 28939637. The next prime is 28939697. The reversal of 28939689 is 98693982.

It is not a de Polignac number, because 28939689 - 2⁸ = 28939433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28939619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4332 + ... + 8754.

Almost surely, 2^28939689 is an apocalyptic number.

It is an amenable number.

28939689 is a deficient number, since it is larger than the sum of its proper divisors (12929047).

28939689 is a wasteful number, since it uses less digits than its factorization.

28939689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156 (or 5153 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 28939689 is about 5379.5621569046. The cubic root of 28939689 is about 307.0185525682.

The spelling of 28939689 in words is "twenty-eight million, nine hundred thirty-nine thousand, six hundred eighty-nine".