28940885 has 8 divisors (see below), whose sum is σ = 36772056. Its totient is φ = 21790720.

The previous prime is 28940881. The next prime is 28940921. The reversal of 28940885 is 58804982.

It can be written as a sum of positive squares in 4 ways, for example, as 1136356 + 27804529 = 1066^2 + 5273^2 .

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

It is not a de Polignac number, because 28940885 - 2² = 28940881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28940881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170156 + ... + 170325.

It is an arithmetic number, because the mean of its divisors is an integer number (4596507).

Almost surely, 2^28940885 is an apocalyptic number.

It is an amenable number.

28940885 is a deficient number, since it is larger than the sum of its proper divisors (7831171).

28940885 is a wasteful number, since it uses less digits than its factorization.

28940885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340503.

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

The square root of 28940885 is about 5379.6733172192. The cubic root of 28940885 is about 307.0227819286.

The spelling of 28940885 in words is "twenty-eight million, nine hundred forty thousand, eight hundred eighty-five".