28397192 has 8 divisors (see below), whose sum is σ = 53244750. Its totient is φ = 14198592.

The previous prime is 28397183. The next prime is 28397197. The reversal of 28397192 is 29179382.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21031396 + 7365796 = 4586^2 + 2714^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28397197) 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 as a sum of consecutive naturals, namely, 1774817 + ... + 1774832.

Almost surely, 2^28397192 is an apocalyptic number.

It is an amenable number.

28397192 is a deficient number, since it is larger than the sum of its proper divisors (24847558).

28397192 is a wasteful number, since it uses less digits than its factorization.

28397192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549655 (or 3549651 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 28397192 is about 5328.9015753718. The cubic root of 28397192 is about 305.0880047041.

The spelling of 28397192 in words is "twenty-eight million, three hundred ninety-seven thousand, one hundred ninety-two".