28749928 has 16 divisors (see below), whose sum is σ = 54180000. Its totient is φ = 14301936.

The previous prime is 28749911. The next prime is 28749961. The reversal of 28749928 is 82994782.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7438 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (3386250).

Almost surely, 2^28749928 is an apocalyptic number.

It is an amenable number.

28749928 is a deficient number, since it is larger than the sum of its proper divisors (25430072).

28749928 is a wasteful number, since it uses less digits than its factorization.

28749928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18264 (or 18260 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 28749928 is about 5361.8959333430. The cubic root of 28749928 is about 306.3460280287.

It can be divided in two parts, 28 and 749928, that added together give a square (749956 = 866²).

The spelling of 28749928 in words is "twenty-eight million, seven hundred forty-nine thousand, nine hundred twenty-eight".