28005726 has 32 divisors (see below), whose sum is σ = 64217088. Its totient is φ = 7976160.

The previous prime is 28005721. The next prime is 28005727. The reversal of 28005726 is 62750082.

It is a junction number, because it is equal to n+sod(n) for n = 28005693 and 28005702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15216 + ... + 16956.

It is an arithmetic number, because the mean of its divisors is an integer number (2006784).

Almost surely, 2^28005726 is an apocalyptic number.

28005726 is an abundant number, since it is smaller than the sum of its proper divisors (36211362).

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

28005726 is a wasteful number, since it uses less digits than its factorization.

28005726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28005726 is about 5292.0436506136. The cubic root of 28005726 is about 303.6795951915.

The spelling of 28005726 in words is "twenty-eight million, five thousand, seven hundred twenty-six".