28006528 has 32 divisors (see below), whose sum is σ = 60869520. Its totient is φ = 12729600.

The previous prime is 28006507. The next prime is 28006543. The reversal of 28006528 is 82560082.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×28006528² = 1568731221229568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28006528.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8538 + ... + 11353.

Almost surely, 2^28006528 is an apocalyptic number.

It is an amenable number.

28006528 is an abundant number, since it is smaller than the sum of its proper divisors (32862992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28006528 is a wasteful number, since it uses less digits than its factorization.

28006528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19916 (or 19904 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28006528 is about 5292.1194242005. The cubic root of 28006528 is about 303.6824939881.

The spelling of 28006528 in words is "twenty-eight million, six thousand, five hundred twenty-eight".