28668945 has 8 divisors (see below), whose sum is σ = 45870336. Its totient is φ = 15290096.

The previous prime is 28668931. The next prime is 28668949. The reversal of 28668945 is 54986682.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28668945 - 2¹² = 28664849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28668894 and 28668903.

It is not an unprimeable number, because it can be changed into a prime (28668949) 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, 955617 + ... + 955646.

It is an arithmetic number, because the mean of its divisors is an integer number (5733792).

Almost surely, 2^28668945 is an apocalyptic number.

It is an amenable number.

28668945 is a deficient number, since it is larger than the sum of its proper divisors (17201391).

28668945 is a wasteful number, since it uses less digits than its factorization.

28668945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911271.

The product of its digits is 829440, while the sum is 48.

The square root of 28668945 is about 5354.3388947656. The cubic root of 28668945 is about 306.0581183129.

It can be divided in two parts, 2866 and 8945, that added together give a palindrome (11811).

The spelling of 28668945 in words is "twenty-eight million, six hundred sixty-eight thousand, nine hundred forty-five".