28640097 has 12 divisors (see below), whose sum is σ = 41634580. Its totient is φ = 18970848.

The previous prime is 28640069. The next prime is 28640119. The reversal of 28640097 is 79004682.

28640097 is a `hidden beast` number, since 2 + 8 + 640 + 0 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15397776 + 13242321 = 3924^2 + 3639^2 .

It is not a de Polignac number, because 28640097 - 2⁶ = 28640033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28640047) 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 11 ways as a sum of consecutive naturals, for example, 8722 + ... + 11547.

Almost surely, 2^28640097 is an apocalyptic number.

It is an amenable number.

28640097 is a deficient number, since it is larger than the sum of its proper divisors (12994483).

28640097 is a wasteful number, since it uses less digits than its factorization.

28640097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20432 (or 20429 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28640097 is about 5351.6443267467. The cubic root of 28640097 is about 305.9554273153.

The spelling of 28640097 in words is "twenty-eight million, six hundred forty thousand, ninety-seven".