28327666 has 4 divisors (see below), whose sum is σ = 42491502. Its totient is φ = 14163832.

The previous prime is 28327657. The next prime is 28327687. The reversal of 28327666 is 66672382.

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., 23726641 + 4601025 = 4871^2 + 2145^2 .

It is a super-2 number, since 2×28327666² = 1604913322015112, 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, 7081915 + ... + 7081918.

Almost surely, 2^28327666 is an apocalyptic number.

28327666 is a deficient number, since it is larger than the sum of its proper divisors (14163836).

28327666 is a wasteful number, since it uses less digits than its factorization.

28327666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14163835.

The product of its digits is 145152, while the sum is 40.

The square root of 28327666 is about 5322.3740943305. The cubic root of 28327666 is about 304.8388147697.

The spelling of 28327666 in words is "twenty-eight million, three hundred twenty-seven thousand, six hundred sixty-six".