28740286 has 16 divisors (see below), whose sum is σ = 44673408. Its totient is φ = 13852800.

The previous prime is 28740281. The next prime is 28740287. The reversal of 28740286 is 68204782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18666 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (2792088).

Almost surely, 2^28740286 is an apocalyptic number.

28740286 is a deficient number, since it is larger than the sum of its proper divisors (15933122).

28740286 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (28740285) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1827).

28740286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28740286 is about 5360.9967356826. The cubic root of 28740286 is about 306.3117772916.

The spelling of 28740286 in words is "twenty-eight million, seven hundred forty thousand, two hundred eighty-six".