28239726 has 16 divisors (see below), whose sum is σ = 56534400. Its totient is φ = 9404088.

The previous prime is 28239713. The next prime is 28239727. The reversal of 28239726 is 62793282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7845 + ... + 10863.

It is an arithmetic number, because the mean of its divisors is an integer number (3533400).

Almost surely, 2^28239726 is an apocalyptic number.

28239726 is an abundant number, since it is smaller than the sum of its proper divisors (28294674).

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

28239726 is a wasteful number, since it uses less digits than its factorization.

28239726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4583.

The product of its digits is 72576, while the sum is 39.

The square root of 28239726 is about 5314.1063218569. The cubic root of 28239726 is about 304.5230420359.

The spelling of 28239726 in words is "twenty-eight million, two hundred thirty-nine thousand, seven hundred twenty-six".