28006668 has 24 divisors (see below), whose sum is σ = 72610160. Its totient is φ = 9335520.

The previous prime is 28006661. The next prime is 28006679. The reversal of 28006668 is 86660082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28006661) 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, 129553 + ... + 129768.

Almost surely, 2^28006668 is an apocalyptic number.

It is an amenable number.

28006668 is an abundant number, since it is smaller than the sum of its proper divisors (44603492).

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

28006668 is a wasteful number, since it uses less digits than its factorization.

28006668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259334 (or 259326 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28006668 is about 5292.1326513987. The cubic root of 28006668 is about 303.6830000068.

The spelling of 28006668 in words is "twenty-eight million, six thousand, six hundred sixty-eight".