28928247 has 16 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 18737600.

The previous prime is 28928233. The next prime is 28928257. The reversal of 28928247 is 74282982.

It is a cyclic number.

It is not a de Polignac number, because 28928247 - 2¹¹ = 28926199 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28928199 and 28928208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928257) 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, 58672 + ... + 59162.

It is an arithmetic number, because the mean of its divisors is an integer number (2479680).

Almost surely, 2^28928247 is an apocalyptic number.

28928247 is a deficient number, since it is larger than the sum of its proper divisors (10746633).

28928247 is a wasteful number, since it uses less digits than its factorization.

28928247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its digits is 129024, while the sum is 42.

The square root of 28928247 is about 5378.4985823183. The cubic root of 28928247 is about 306.9780848521.

The spelling of 28928247 in words is "twenty-eight million, nine hundred twenty-eight thousand, two hundred forty-seven".