28747647 has 6 divisors (see below), whose sum is σ = 41524392. Its totient is φ = 19165092.

The previous prime is 28747577. The next prime is 28747651. The reversal of 28747647 is 74674782.

It is not a de Polignac number, because 28747647 - 2¹⁰ = 28746623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1597083 + ... + 1597100.

It is an arithmetic number, because the mean of its divisors is an integer number (6920732).

Almost surely, 2^28747647 is an apocalyptic number.

28747647 is a deficient number, since it is larger than the sum of its proper divisors (12776745).

28747647 is a wasteful number, since it uses less digits than its factorization.

28747647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194189 (or 3194186 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 28747647 is about 5361.6832245108. The cubic root of 28747647 is about 306.3379260516.

The spelling of 28747647 in words is "twenty-eight million, seven hundred forty-seven thousand, six hundred forty-seven".