28343666 has 12 divisors (see below), whose sum is σ = 46038042. Its totient is φ = 13081536.

The previous prime is 28343657. The next prime is 28343683. The reversal of 28343666 is 66634382.

It can be written as a sum of positive squares in 3 ways, for example, as 13359025 + 14984641 = 3655^2 + 3871^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41591 + ... + 42266.

Almost surely, 2^28343666 is an apocalyptic number.

28343666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28343666 is a deficient number, since it is larger than the sum of its proper divisors (17694376).

28343666 is a wasteful number, since it uses less digits than its factorization.

28343666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83885 (or 83872 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 28343666 is about 5323.8769707798. The cubic root of 28343666 is about 304.8961968715.

The spelling of 28343666 in words is "twenty-eight million, three hundred forty-three thousand, six hundred sixty-six".