28717738 has 8 divisors (see below), whose sum is σ = 49230432. Its totient is φ = 12307596.

The previous prime is 28717729. The next prime is 28717747. The reversal of 28717738 is 83771782.

It is an interprime number because it is at equal distance from previous prime (28717729) and next prime (28717747).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28717694 and 28717703.

It is an unprimeable number.

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, 1025620 + ... + 1025647.

It is an arithmetic number, because the mean of its divisors is an integer number (6153804).

Almost surely, 2^28717738 is an apocalyptic number.

28717738 is a deficient number, since it is larger than the sum of its proper divisors (20512694).

28717738 is a wasteful number, since it uses less digits than its factorization.

28717738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051276.

The product of its digits is 131712, while the sum is 43.

The square root of 28717738 is about 5358.8933559085. The cubic root of 28717738 is about 306.2316513788.

It can be divided in two parts, 2871 and 7738, that added together give a square (10609 = 103²).

The spelling of 28717738 in words is "twenty-eight million, seven hundred seventeen thousand, seven hundred thirty-eight".