28656263 has 4 divisors (see below), whose sum is σ = 29644440. Its totient is φ = 27668088.

The previous prime is 28656259. The next prime is 28656283. The reversal of 28656263 is 36265682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28656263 - 2² = 28656259 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 (28656283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494045 + ... + 494102.

It is an arithmetic number, because the mean of its divisors is an integer number (7411110).

Almost surely, 2^28656263 is an apocalyptic number.

28656263 is a deficient number, since it is larger than the sum of its proper divisors (988177).

28656263 is an equidigital number, since it uses as much as digits as its factorization.

28656263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988176.

The product of its digits is 103680, while the sum is 38.

The square root of 28656263 is about 5353.1544905784. The cubic root of 28656263 is about 306.0129823475.

The spelling of 28656263 in words is "twenty-eight million, six hundred fifty-six thousand, two hundred sixty-three".