28903393 has 2 divisors, whose sum is σ = 28903394. Its totient is φ = 28903392.

The previous prime is 28903367. The next prime is 28903409. The reversal of 28903393 is 39330982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27541504 + 1361889 = 5248^2 + 1167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28903393 is a prime.

It is a super-2 number, since 2×28903393² = 1670812253824898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28903093) 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, 14451696 + 14451697.

It is an arithmetic number, because the mean of its divisors is an integer number (14451697).

Almost surely, 2^28903393 is an apocalyptic number.

It is an amenable number.

28903393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28903393 is an equidigital number, since it uses as much as digits as its factorization.

28903393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 28903393 is about 5376.1875897331. The cubic root of 28903393 is about 306.8901452062.

The spelling of 28903393 in words is "twenty-eight million, nine hundred three thousand, three hundred ninety-three".