28059521 has 16 divisors (see below), whose sum is σ = 33289344. Its totient is φ = 23151744.

The previous prime is 28059487. The next prime is 28059527. The reversal of 28059521 is 12595082.

It is a de Polignac number, because none of the positive numbers 2^k-28059521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28059527) 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, 21335 + ... + 22611.

It is an arithmetic number, because the mean of its divisors is an integer number (2080584).

Almost surely, 2^28059521 is an apocalyptic number.

It is an amenable number.

28059521 is a deficient number, since it is larger than the sum of its proper divisors (5229823).

28059521 is a wasteful number, since it uses less digits than its factorization.

28059521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28059521 is about 5297.1238422374. The cubic root of 28059521 is about 303.8739125367.

The spelling of 28059521 in words is "twenty-eight million, fifty-nine thousand, five hundred twenty-one".