28578263 has 4 divisors (see below), whose sum is σ = 32660880. Its totient is φ = 24495648.

The previous prime is 28578257. The next prime is 28578269. The reversal of 28578263 is 36287582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36287582 = 2 ⋅18143791.

It is an interprime number because it is at equal distance from previous prime (28578257) and next prime (28578269).

It is a cyclic number.

It is not a de Polignac number, because 28578263 - 2¹⁴ = 28561879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28578263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578269) 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 in 3 ways as a sum of consecutive naturals, for example, 2041298 + ... + 2041311.

It is an arithmetic number, because the mean of its divisors is an integer number (8165220).

Almost surely, 2^28578263 is an apocalyptic number.

28578263 is a deficient number, since it is larger than the sum of its proper divisors (4082617).

28578263 is an equidigital number, since it uses as much as digits as its factorization.

28578263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4082616.

The product of its digits is 161280, while the sum is 41.

The square root of 28578263 is about 5345.8641022757. The cubic root of 28578263 is about 305.7350826329.

The spelling of 28578263 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred sixty-three".