28205132 has 6 divisors (see below), whose sum is σ = 49358988. Its totient is φ = 14102564.

The previous prime is 28205087. The next prime is 28205147. The reversal of 28205132 is 23150282.

It is a super-2 number, since 2×28205132² = 1591058942274848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28205098 and 28205107.

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 as a sum of consecutive naturals, namely, 3525638 + ... + 3525645.

It is an arithmetic number, because the mean of its divisors is an integer number (8226498).

Almost surely, 2^28205132 is an apocalyptic number.

It is an amenable number.

28205132 is a deficient number, since it is larger than the sum of its proper divisors (21153856).

28205132 is a wasteful number, since it uses less digits than its factorization.

28205132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051287 (or 7051285 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28205132 is about 5310.8504027133. The cubic root of 28205132 is about 304.3986431100.

The spelling of 28205132 in words is "twenty-eight million, two hundred five thousand, one hundred thirty-two".