28966521 has 16 divisors (see below), whose sum is σ = 41568768.
Its totient is φ = 17875200.
The previous prime is 28966517. The next prime is 28966529. The reversal of 28966521 is 12566982.
It is not a de Polignac number, because 28966521 - 22 = 28966517 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 28966521.
It is not an unprimeable number, because it can be changed into a prime (28966529) 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, 1545 + ... + 7766.
It is an arithmetic number, because the mean of its divisors is an integer number (2598048).
Almost surely, 228966521 is an apocalyptic number.
It is an amenable number.
28966521 is a deficient number, since it is larger than the sum of its proper divisors (12602247).
28966521 is a wasteful number, since it uses less digits than its factorization.
28966521 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9392.
The product of its digits is 51840, while the sum is 39.
The square root of 28966521 is about 5382.0554623675.
The cubic root of 28966521 is about 307.1134093481.
The spelling of 28966521 in words is "twenty-eight million, nine hundred sixty-six thousand, five hundred twenty-one".