18208528 has 20 divisors (see below), whose sum is σ = 37993228. Its totient is φ = 8403840.

The previous prime is 18208499. The next prime is 18208537. The reversal of 18208528 is 82580281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5161984 + 13046544 = 2272^2 + 3612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18208493 and 18208502.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 43563 + ... + 43978.

Almost surely, 2^18208528 is an apocalyptic number.

It is an amenable number.

18208528 is an abundant number, since it is smaller than the sum of its proper divisors (19784700).

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

18208528 is a wasteful number, since it uses less digits than its factorization.

18208528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87562 (or 87556 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 18208528 is about 4267.1451815002. The cubic root of 18208528 is about 263.0822895453.

The spelling of 18208528 in words is "eighteen million, two hundred eight thousand, five hundred twenty-eight".