28661885 has 16 divisors (see below), whose sum is σ = 39661056. Its totient is φ = 19477248.

The previous prime is 28661879. The next prime is 28661891. The reversal of 28661885 is 58816682.

It is an interprime number because it is at equal distance from previous prime (28661879) and next prime (28661891).

It is not a de Polignac number, because 28661885 - 2⁸ = 28661629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332 + ... + 7578.

It is an arithmetic number, because the mean of its divisors is an integer number (2478816).

Almost surely, 2^28661885 is an apocalyptic number.

It is an amenable number.

28661885 is a deficient number, since it is larger than the sum of its proper divisors (10999171).

28661885 is a wasteful number, since it uses less digits than its factorization.

28661885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7372.

The product of its digits is 184320, while the sum is 44.

The square root of 28661885 is about 5353.6795757684. The cubic root of 28661885 is about 306.0329930108.

The spelling of 28661885 in words is "twenty-eight million, six hundred sixty-one thousand, eight hundred eighty-five".