28440726 has 16 divisors (see below), whose sum is σ = 56958384. Its totient is φ = 9467424.

The previous prime is 28440721. The next prime is 28440743. The reversal of 28440726 is 62704482.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440721) 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, 2340 + ... + 7896.

It is an arithmetic number, because the mean of its divisors is an integer number (3559899).

Almost surely, 2^28440726 is an apocalyptic number.

28440726 is an abundant number, since it is smaller than the sum of its proper divisors (28517658).

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

28440726 is a wasteful number, since it uses less digits than its factorization.

28440726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 28440726 is about 5332.9847177730. The cubic root of 28440726 is about 305.2438290294.

The spelling of 28440726 in words is "twenty-eight million, four hundred forty thousand, seven hundred twenty-six".