28689507 has 24 divisors (see below), whose sum is σ = 51667200. Its totient is φ = 14903280.

The previous prime is 28689499. The next prime is 28689527. The reversal of 28689507 is 70598682.

It is not a de Polignac number, because 28689507 - 2³ = 28689499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28689527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20007 + ... + 21392.

It is an arithmetic number, because the mean of its divisors is an integer number (2152800).

Almost surely, 2^28689507 is an apocalyptic number.

28689507 is a deficient number, since it is larger than the sum of its proper divisors (22977693).

28689507 is a wasteful number, since it uses less digits than its factorization.

28689507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41423 (or 41420 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28689507 is about 5356.2586756056. The cubic root of 28689507 is about 306.1312713721.

The spelling of 28689507 in words is "twenty-eight million, six hundred eighty-nine thousand, five hundred seven".