28409666 has 8 divisors (see below), whose sum is σ = 43028544. Its totient is φ = 14066820.

The previous prime is 28409659. The next prime is 28409687. The reversal of 28409666 is 66690482.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68750 + ... + 69161.

It is an arithmetic number, because the mean of its divisors is an integer number (5378568).

Almost surely, 2^28409666 is an apocalyptic number.

28409666 is a deficient number, since it is larger than the sum of its proper divisors (14618878).

28409666 is a wasteful number, since it uses less digits than its factorization.

28409666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138016.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 28409666 is about 5330.0718569265. The cubic root of 28409666 is about 305.1326700437.

The spelling of 28409666 in words is "twenty-eight million, four hundred nine thousand, six hundred sixty-six".