28397894 has 16 divisors (see below), whose sum is σ = 51244800. Its totient is φ = 11529864.

The previous prime is 28397881. The next prime is 28397899. The reversal of 28397894 is 49879382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28397899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53114 + ... + 53645.

It is an arithmetic number, because the mean of its divisors is an integer number (3202800).

Almost surely, 2^28397894 is an apocalyptic number.

28397894 is a deficient number, since it is larger than the sum of its proper divisors (22846906).

28397894 is a wasteful number, since it uses less digits than its factorization.

28397894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106787.

The product of its digits is 870912, while the sum is 50.

The square root of 28397894 is about 5328.9674421974. The cubic root of 28397894 is about 305.0905186852.

The spelling of 28397894 in words is "twenty-eight million, three hundred ninety-seven thousand, eight hundred ninety-four".