28723868 has 12 divisors (see below), whose sum is σ = 50309280. Its totient is φ = 14349792.

The previous prime is 28723867. The next prime is 28723873. The reversal of 28723868 is 86832782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723867) 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 3 ways as a sum of consecutive naturals, for example, 4205 + ... + 8667.

It is an arithmetic number, because the mean of its divisors is an integer number (4192440).

Almost surely, 2^28723868 is an apocalyptic number.

It is an amenable number.

28723868 is a deficient number, since it is larger than the sum of its proper divisors (21585412).

28723868 is a wasteful number, since it uses less digits than its factorization.

28723868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6076 (or 6074 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 28723868 is about 5359.4652718345. The cubic root of 28723868 is about 306.2534389174.

The spelling of 28723868 in words is "twenty-eight million, seven hundred twenty-three thousand, eight hundred sixty-eight".