28487747 has 4 divisors (see below), whose sum is σ = 28601496. Its totient is φ = 28374000.

The previous prime is 28487741. The next prime is 28487803. The reversal of 28487747 is 74778482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74778482 = 2 ⋅37389241.

It is a cyclic number.

It is not a de Polignac number, because 28487747 - 2²⁰ = 27439171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28487741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56498 + ... + 56999.

It is an arithmetic number, because the mean of its divisors is an integer number (7150374).

Almost surely, 2^28487747 is an apocalyptic number.

28487747 is a deficient number, since it is larger than the sum of its proper divisors (113749).

28487747 is a wasteful number, since it uses less digits than its factorization.

28487747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113748.

The product of its digits is 702464, while the sum is 47.

The square root of 28487747 is about 5337.3914040475. The cubic root of 28487747 is about 305.4119560958.

The spelling of 28487747 in words is "twenty-eight million, four hundred eighty-seven thousand, seven hundred forty-seven".