28398726 has 24 divisors (see below), whose sum is σ = 61629984. Its totient is φ = 9450960.

The previous prime is 28398707. The next prime is 28398761. The reversal of 28398726 is 62789382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18355 + ... + 19841.

It is an arithmetic number, because the mean of its divisors is an integer number (2567916).

Almost surely, 2^28398726 is an apocalyptic number.

28398726 is an abundant number, since it is smaller than the sum of its proper divisors (33231258).

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

28398726 is a wasteful number, since it uses less digits than its factorization.

28398726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2553 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28398726 is about 5329.0455055291. The cubic root of 28398726 is about 305.0934981648.

The spelling of 28398726 in words is "twenty-eight million, three hundred ninety-eight thousand, seven hundred twenty-six".