28520293 has 2 divisors, whose sum is σ = 28520294. Its totient is φ = 28520292.

The previous prime is 28520291. The next prime is 28520321. The reversal of 28520293 is 39202582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27227524 + 1292769 = 5218^2 + 1137^2 .

It is a cyclic number.

It is not a de Polignac number, because 28520293 - 2¹ = 28520291 is a prime.

It is a super-2 number, since 2×28520293² = 1626814225611698, which contains 22 as substring.

Together with 28520291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28520291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14260146 + 14260147.

It is an arithmetic number, because the mean of its divisors is an integer number (14260147).

Almost surely, 2^28520293 is an apocalyptic number.

It is an amenable number.

28520293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28520293 is an equidigital number, since it uses as much as digits as its factorization.

28520293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28520293 is about 5340.4394013976. The cubic root of 28520293 is about 305.5282184150.

The spelling of 28520293 in words is "twenty-eight million, five hundred twenty thousand, two hundred ninety-three".