28897357 has 2 divisors, whose sum is σ = 28897358. Its totient is φ = 28897356.

The previous prime is 28897343. The next prime is 28897373. The reversal of 28897357 is 75379882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25918281 + 2979076 = 5091^2 + 1726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28897357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28897357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28897307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14448678 + 14448679.

It is an arithmetic number, because the mean of its divisors is an integer number (14448679).

Almost surely, 2^28897357 is an apocalyptic number.

It is an amenable number.

28897357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897357 is an equidigital number, since it uses as much as digits as its factorization.

28897357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 28897357 is about 5375.6261960817. The cubic root of 28897357 is about 306.8687807263.

It can be divided in two parts, 288 and 97357, that multiplied together give a triangular number (28038816 = T₇₄₈₈).

The spelling of 28897357 in words is "twenty-eight million, eight hundred ninety-seven thousand, three hundred fifty-seven".