28886661 has 12 divisors (see below), whose sum is σ = 41779660. Its totient is φ = 19232640.

The previous prime is 28886653. The next prime is 28886681. The reversal of 28886661 is 16668882.

It can be written as a sum of positive squares in 2 ways, for example, as 5062500 + 23824161 = 2250^2 + 4881^2 .

It is not a de Polignac number, because 28886661 - 2³ = 28886653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28886651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7491 + ... + 10671.

Almost surely, 2^28886661 is an apocalyptic number.

It is an amenable number.

28886661 is a deficient number, since it is larger than the sum of its proper divisors (12892999).

28886661 is a wasteful number, since it uses less digits than its factorization.

28886661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196 (or 4193 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 28886661 is about 5374.6312431645. The cubic root of 28886661 is about 306.8309148236.

The spelling of 28886661 in words is "twenty-eight million, eight hundred eighty-six thousand, six hundred sixty-one".