28628617 has 4 divisors (see below), whose sum is σ = 28639360. Its totient is φ = 28617876.

The previous prime is 28628603. The next prime is 28628623. The reversal of 28628617 is 71682682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28628617 - 2⁷ = 28628489 is a prime.

It is a super-3 number, since 3×28628617³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28628617.

It is not an unprimeable number, because it can be changed into a prime (28628627) 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, 1984 + ... + 7822.

It is an arithmetic number, because the mean of its divisors is an integer number (7159840).

Almost surely, 2^28628617 is an apocalyptic number.

It is an amenable number.

28628617 is a deficient number, since it is larger than the sum of its proper divisors (10743).

28628617 is an equidigital number, since it uses as much as digits as its factorization.

28628617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10742.

The product of its digits is 64512, while the sum is 40.

The square root of 28628617 is about 5350.5716517023. The cubic root of 28628617 is about 305.9145424711.

The spelling of 28628617 in words is "twenty-eight million, six hundred twenty-eight thousand, six hundred seventeen".