28688706 has 24 divisors (see below), whose sum is σ = 63483264. Its totient is φ = 9359160.

The previous prime is 28688687. The next prime is 28688711. The reversal of 28688706 is 60788682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16110 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (2645136).

Almost surely, 2^28688706 is an apocalyptic number.

28688706 is an abundant number, since it is smaller than the sum of its proper divisors (34794558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28688706 is a wasteful number, since it uses less digits than its factorization.

28688706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33966 (or 33963 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28688706 is about 5356.1839027427. The cubic root of 28688706 is about 306.1284223232.

The spelling of 28688706 in words is "twenty-eight million, six hundred eighty-eight thousand, seven hundred six".