28820635 has 16 divisors (see below), whose sum is σ = 36547200. Its totient is φ = 21782656.

The previous prime is 28820629. The next prime is 28820639. The reversal of 28820635 is 53602882.

It is a cyclic number.

It is not a de Polignac number, because 28820635 - 2¹⁵ = 28787867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28820635.

It is not an unprimeable number, because it can be changed into a prime (28820639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4701 + ... + 8929.

It is an arithmetic number, because the mean of its divisors is an integer number (2284200).

Almost surely, 2^28820635 is an apocalyptic number.

28820635 is a deficient number, since it is larger than the sum of its proper divisors (7726565).

28820635 is a wasteful number, since it uses less digits than its factorization.

28820635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28820635 is about 5368.4853543621. The cubic root of 28820635 is about 306.5969628651.

The spelling of 28820635 in words is "twenty-eight million, eight hundred twenty thousand, six hundred thirty-five".