28847709 has 24 divisors (see below), whose sum is σ = 45705504. Its totient is φ = 17388000.

The previous prime is 28847699. The next prime is 28847737. The reversal of 28847709 is 90774882.

It is not a de Polignac number, because 28847709 - 2⁵ = 28847677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28843709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20199 + ... + 21579.

It is an arithmetic number, because the mean of its divisors is an integer number (1904396).

Almost surely, 2^28847709 is an apocalyptic number.

It is an amenable number.

28847709 is a deficient number, since it is larger than the sum of its proper divisors (16857795).

28847709 is a wasteful number, since it uses less digits than its factorization.

28847709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28847709 is about 5371.0063302886. The cubic root of 28847709 is about 306.6929381767.

The spelling of 28847709 in words is "twenty-eight million, eight hundred forty-seven thousand, seven hundred nine".