28347738 has 16 divisors (see below), whose sum is σ = 60030720. Its totient is φ = 8893376.

The previous prime is 28347731. The next prime is 28347743. The reversal of 28347738 is 83774382.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28347738.

It is not an unprimeable number, because it can be changed into a prime (28347731) 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, 138858 + ... + 139061.

It is an arithmetic number, because the mean of its divisors is an integer number (3751920).

Almost surely, 2^28347738 is an apocalyptic number.

28347738 is an abundant number, since it is smaller than the sum of its proper divisors (31682982).

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

28347738 is a wasteful number, since it uses less digits than its factorization.

28347738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277941.

The product of its digits is 225792, while the sum is 42.

The square root of 28347738 is about 5324.2593851164. The cubic root of 28347738 is about 304.9107971689.

The spelling of 28347738 in words is "twenty-eight million, three hundred forty-seven thousand, seven hundred thirty-eight".