28680861 has 32 divisors (see below), whose sum is σ = 44352000. Its totient is φ = 16303680.

The previous prime is 28680829. The next prime is 28680881. The reversal of 28680861 is 16808682.

It is not a de Polignac number, because 28680861 - 2⁵ = 28680829 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93270 + ... + 93576.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^28680861 is an apocalyptic number.

It is an amenable number.

28680861 is a deficient number, since it is larger than the sum of its proper divisors (15671139).

28680861 is a wasteful number, since it uses less digits than its factorization.

28680861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28680861 is about 5355.4515215806. The cubic root of 28680861 is about 306.1005159127.

The spelling of 28680861 in words is "twenty-eight million, six hundred eighty thousand, eight hundred sixty-one".