28868747 has 4 divisors (see below), whose sum is σ = 29018520. Its totient is φ = 28718976.

The previous prime is 28868711. The next prime is 28868761. The reversal of 28868747 is 74786882.

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 28868747 - 2¹⁰ = 28867723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28868695 and 28868704.

It is not an unprimeable number, because it can be changed into a prime (28865747) 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, 74597 + ... + 74982.

It is an arithmetic number, because the mean of its divisors is an integer number (7254630).

Almost surely, 2^28868747 is an apocalyptic number.

28868747 is a deficient number, since it is larger than the sum of its proper divisors (149773).

28868747 is a wasteful number, since it uses less digits than its factorization.

28868747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149772.

The product of its digits is 1204224, while the sum is 50.

The square root of 28868747 is about 5372.9644517715. The cubic root of 28868747 is about 306.7674748662.

The spelling of 28868747 in words is "twenty-eight million, eight hundred sixty-eight thousand, seven hundred forty-seven".