28726868 has 6 divisors (see below), whose sum is σ = 50272026. Its totient is φ = 14363432.

The previous prime is 28726861. The next prime is 28726871. The reversal of 28726868 is 86862782.

It can be written as a sum of positive squares in only one way, i.e., 23833924 + 4892944 = 4882^2 + 2212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28726861) 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 as a sum of consecutive naturals, namely, 3590855 + ... + 3590862.

It is an arithmetic number, because the mean of its divisors is an integer number (8378671).

Almost surely, 2^28726868 is an apocalyptic number.

It is an amenable number.

28726868 is a deficient number, since it is larger than the sum of its proper divisors (21545158).

28726868 is a wasteful number, since it uses less digits than its factorization.

28726868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7181721 (or 7181719 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 28726868 is about 5359.7451431948. The cubic root of 28726868 is about 306.2641005308.

The spelling of 28726868 in words is "twenty-eight million, seven hundred twenty-six thousand, eight hundred sixty-eight".