28807633 has 4 divisors (see below), whose sum is σ = 28847668. Its totient is φ = 28767600.

The previous prime is 28807631. The next prime is 28807637. The reversal of 28807633 is 33670882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20322064 + 8485569 = 4508^2 + 2913^2 .

It is a cyclic number.

It is not a de Polignac number, because 28807633 - 2¹ = 28807631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28807592 and 28807601.

It is not an unprimeable number, because it can be changed into a prime (28807631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18918 + ... + 20383.

It is an arithmetic number, because the mean of its divisors is an integer number (7211917).

Almost surely, 2^28807633 is an apocalyptic number.

It is an amenable number.

28807633 is a deficient number, since it is larger than the sum of its proper divisors (40035).

28807633 is an equidigital number, since it uses as much as digits as its factorization.

28807633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40034.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28807633 is about 5367.2742616714. The cubic root of 28807633 is about 306.5508503797.

The spelling of 28807633 in words is "twenty-eight million, eight hundred seven thousand, six hundred thirty-three".