28005263 has 32 divisors (see below), whose sum is σ = 34728960. Its totient is φ = 22239360.

The previous prime is 28005247. The next prime is 28005269. The reversal of 28005263 is 36250082.

It is a Cunningham number, because it is equal to 5292²-1.

It is not a de Polignac number, because 28005263 - 2⁴ = 28005247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354458 + ... + 354536.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^28005263 is an apocalyptic number.

28005263 is a deficient number, since it is larger than the sum of its proper divisors (6723697).

28005263 is a wasteful number, since it uses less digits than its factorization.

28005263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 28005263 is about 5291.9999055178. Note that the first 4 decimals coincide. The cubic root of 28005263 is about 303.6779216715.

The spelling of 28005263 in words is "twenty-eight million, five thousand, two hundred sixty-three".