28751728 has 10 divisors (see below), whose sum is σ = 55706504. Its totient is φ = 14375856.

The previous prime is 28751713. The next prime is 28751741. The reversal of 28751728 is 82715782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 898476 + ... + 898507.

Almost surely, 2^28751728 is an apocalyptic number.

It is an amenable number.

28751728 is a deficient number, since it is larger than the sum of its proper divisors (26954776).

28751728 is a wasteful number, since it uses less digits than its factorization.

28751728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796991 (or 1796985 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 28751728 is about 5362.0637817915. The cubic root of 28751728 is about 306.3524212197.

The spelling of 28751728 in words is "twenty-eight million, seven hundred fifty-one thousand, seven hundred twenty-eight".