28728744 has 32 divisors (see below), whose sum is σ = 78351840. Its totient is φ = 8705600.

The previous prime is 28728731. The next prime is 28728769. The reversal of 28728744 is 44782782.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 28728696 and 28728705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54147 + ... + 54674.

It is an arithmetic number, because the mean of its divisors is an integer number (2448495).

Almost surely, 2^28728744 is an apocalyptic number.

28728744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28728744 is an abundant number, since it is smaller than the sum of its proper divisors (49623096).

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

28728744 is a wasteful number, since it uses less digits than its factorization.

28728744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108841 (or 108837 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 28728744 is about 5359.9201486589. The cubic root of 28728744 is about 306.2707672159.

The spelling of 28728744 in words is "twenty-eight million, seven hundred twenty-eight thousand, seven hundred forty-four".