28569688 has 32 divisors (see below), whose sum is σ = 62265600. Its totient is φ = 12035232.

The previous prime is 28569649. The next prime is 28569689. The reversal of 28569688 is 88696582.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28569689) 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 7 ways as a sum of consecutive naturals, for example, 1020 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (1945800).

Almost surely, 2^28569688 is an apocalyptic number.

28569688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28569688 is an abundant number, since it is smaller than the sum of its proper divisors (33695912).

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

28569688 is a wasteful number, since it uses less digits than its factorization.

28569688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8719 (or 8715 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The square root of 28569688 is about 5345.0620202202. The cubic root of 28569688 is about 305.7045006414.

It can be divided in two parts, 2856 and 9688, that added together give a square (12544 = 112²).

The spelling of 28569688 in words is "twenty-eight million, five hundred sixty-nine thousand, six hundred eighty-eight".