28666975 has 6 divisors (see below), whose sum is σ = 35547080. Its totient is φ = 22933560.

The previous prime is 28666969. The next prime is 28666987. The reversal of 28666975 is 57966682.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28666975 is a prime.

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, 573315 + ... + 573364.

Almost surely, 2^28666975 is an apocalyptic number.

28666975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28666975 is a deficient number, since it is larger than the sum of its proper divisors (6880105).

28666975 is a wasteful number, since it uses less digits than its factorization.

28666975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146689 (or 1146684 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 28666975 is about 5354.1549286512. The cubic root of 28666975 is about 306.0511078433.

The spelling of 28666975 in words is "twenty-eight million, six hundred sixty-six thousand, nine hundred seventy-five".