28280747 has 16 divisors (see below), whose sum is σ = 31726080. Its totient is φ = 24991200.

The previous prime is 28280723. The next prime is 28280753. The reversal of 28280747 is 74708282.

It is a cyclic number.

It is not a de Polignac number, because 28280747 - 2⁸ = 28280491 is a prime.

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 28280747.

It is not an unprimeable number, because it can be changed into a prime (28280717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104222 + ... + 104492.

It is an arithmetic number, because the mean of its divisors is an integer number (1982880).

Almost surely, 2^28280747 is an apocalyptic number.

28280747 is a deficient number, since it is larger than the sum of its proper divisors (3445333).

28280747 is a wasteful number, since it uses less digits than its factorization.

28280747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28280747 is about 5317.9645542256. The cubic root of 28280747 is about 304.6704206617.

The spelling of 28280747 in words is "twenty-eight million, two hundred eighty thousand, seven hundred forty-seven".