28628311 has 4 divisors (see below), whose sum is σ = 29237472. Its totient is φ = 28019152.

The previous prime is 28628297. The next prime is 28628359. The reversal of 28628311 is 11382682.

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

It is a cyclic number.

It is not a de Polignac number, because 28628311 - 2¹⁷ = 28497239 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28628371) 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, 304510 + ... + 304603.

It is an arithmetic number, because the mean of its divisors is an integer number (7309368).

Almost surely, 2^28628311 is an apocalyptic number.

28628311 is a deficient number, since it is larger than the sum of its proper divisors (609161).

28628311 is an equidigital number, since it uses as much as digits as its factorization.

28628311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609160.

The product of its digits is 4608, while the sum is 31.

The square root of 28628311 is about 5350.5430565504. The cubic root of 28628311 is about 305.9134525339.

The spelling of 28628311 in words is "twenty-eight million, six hundred twenty-eight thousand, three hundred eleven".