28489666 has 4 divisors (see below), whose sum is σ = 42734502. Its totient is φ = 14244832.

The previous prime is 28489649. The next prime is 28489723. The reversal of 28489666 is 66698482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26224641 + 2265025 = 5121^2 + 1505^2 .

It is a super-2 number, since 2×28489666² = 1623322137583112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7122415 + ... + 7122418.

Almost surely, 2^28489666 is an apocalyptic number.

28489666 is a deficient number, since it is larger than the sum of its proper divisors (14244836).

28489666 is a wasteful number, since it uses less digits than its factorization.

28489666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244835.

The product of its digits is 995328, while the sum is 49.

The square root of 28489666 is about 5337.5711704857. The cubic root of 28489666 is about 305.4188136918.

The spelling of 28489666 in words is "twenty-eight million, four hundred eighty-nine thousand, six hundred sixty-six".