28658643 has 8 divisors (see below), whose sum is σ = 41150928. Its totient is φ = 17636064.

The previous prime is 28658639. The next prime is 28658657. The reversal of 28658643 is 34685682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28658643 - 2² = 28658639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28658595 and 28658604.

It is not an unprimeable number, because it can be changed into a prime (28658633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367380 + ... + 367457.

It is an arithmetic number, because the mean of its divisors is an integer number (5143866).

Almost surely, 2^28658643 is an apocalyptic number.

28658643 is a deficient number, since it is larger than the sum of its proper divisors (12492285).

28658643 is a wasteful number, since it uses less digits than its factorization.

28658643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734853.

The product of its digits is 276480, while the sum is 42.

The square root of 28658643 is about 5353.3767847967. The cubic root of 28658643 is about 306.0214539189.

The spelling of 28658643 in words is "twenty-eight million, six hundred fifty-eight thousand, six hundred forty-three".