28297647 has 48 divisors (see below), whose sum is σ = 49603680. Its totient is φ = 15894144.

The previous prime is 28297603. The next prime is 28297657. The reversal of 28297647 is 74679282.

It is not a de Polignac number, because 28297647 - 2⁶ = 28297583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96433 + ... + 96725.

It is an arithmetic number, because the mean of its divisors is an integer number (1033410).

Almost surely, 2^28297647 is an apocalyptic number.

28297647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28297647 is a deficient number, since it is larger than the sum of its proper divisors (21306033).

28297647 is a wasteful number, since it uses less digits than its factorization.

28297647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 376 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 28297647 is about 5319.5532707174. The cubic root of 28297647 is about 304.7310968621.

The spelling of 28297647 in words is "twenty-eight million, two hundred ninety-seven thousand, six hundred forty-seven".