28861668 has 36 divisors (see below), whose sum is σ = 79589328. Its totient is φ = 8745840.

The previous prime is 28861667. The next prime is 28861697. The reversal of 28861668 is 86616882.

28861668 is a `hidden beast` number, since 28 + 8 + 616 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28861667) 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, 36046 + ... + 36837.

Almost surely, 2^28861668 is an apocalyptic number.

It is an amenable number.

28861668 is an abundant number, since it is smaller than the sum of its proper divisors (50727660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28861668 is a wasteful number, since it uses less digits than its factorization.

28861668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72904 (or 72899 counting only the distinct ones).

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

The square root of 28861668 is about 5372.3056502772. The cubic root of 28861668 is about 306.7423983307.

It can be divided in two parts, 2886 and 1668, that added together give a palindrome (4554).

The spelling of 28861668 in words is "twenty-eight million, eight hundred sixty-one thousand, six hundred sixty-eight".