28968521 has 16 divisors (see below), whose sum is σ = 31737600. Its totient is φ = 26345088.

The previous prime is 28968491. The next prime is 28968551. The reversal of 28968521 is 12586982.

It is an interprime number because it is at equal distance from previous prime (28968491) and next prime (28968551).

It is a cyclic number.

It is not a de Polignac number, because 28968521 - 2¹⁴ = 28952137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28968551) 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 15 ways as a sum of consecutive naturals, for example, 62336 + ... + 62798.

It is an arithmetic number, because the mean of its divisors is an integer number (1983600).

Almost surely, 2^28968521 is an apocalyptic number.

It is an amenable number.

28968521 is a deficient number, since it is larger than the sum of its proper divisors (2769079).

28968521 is a wasteful number, since it uses less digits than its factorization.

28968521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its digits is 69120, while the sum is 41.

The square root of 28968521 is about 5382.2412617793. The cubic root of 28968521 is about 307.1204774237.

The spelling of 28968521 in words is "twenty-eight million, nine hundred sixty-eight thousand, five hundred twenty-one".