28032506 has 8 divisors (see below), whose sum is σ = 42071700. Its totient is φ = 14008608.

The previous prime is 28032491. The next prime is 28032523. The reversal of 28032506 is 60523082.

It can be written as a sum of positive squares in 2 ways, for example, as 22005481 + 6027025 = 4691^2 + 2455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 3800 + ... + 8396.

Almost surely, 2^28032506 is an apocalyptic number.

28032506 is a deficient number, since it is larger than the sum of its proper divisors (14039194).

28032506 is a wasteful number, since it uses less digits than its factorization.

28032506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 28032506 is about 5294.5732594799. The cubic root of 28032506 is about 303.7763605070.

Adding to 28032506 its reverse (60523082), we get a palindrome (88555588).

The spelling of 28032506 in words is "twenty-eight million, thirty-two thousand, five hundred six".