28628313 has 16 divisors (see below), whose sum is σ = 43739136. Its totient is φ = 16315920.

The previous prime is 28628297. The next prime is 28628359. The reversal of 28628313 is 31382682.

It is not a de Polignac number, because 28628313 - 2⁴ = 28628297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28628113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7470 + ... + 10632.

It is an arithmetic number, because the mean of its divisors is an integer number (2733696).

Almost surely, 2^28628313 is an apocalyptic number.

It is an amenable number.

28628313 is a deficient number, since it is larger than the sum of its proper divisors (15110823).

28628313 is a wasteful number, since it uses less digits than its factorization.

28628313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604.

The product of its digits is 13824, while the sum is 33.

The square root of 28628313 is about 5350.5432434473. The cubic root of 28628313 is about 305.9134596577.

It can be divided in two parts, 2862 and 8313, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 28628313 in words is "twenty-eight million, six hundred twenty-eight thousand, three hundred thirteen".