28166973 has 8 divisors (see below), whose sum is σ = 39188928. Its totient is φ = 17961504.

The previous prime is 28166947. The next prime is 28166989. The reversal of 28166973 is 37966182.

It is a happy number.

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

It is not a de Polignac number, because 28166973 - 2⁸ = 28166717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204040 + ... + 204177.

It is an arithmetic number, because the mean of its divisors is an integer number (4898616).

Almost surely, 2^28166973 is an apocalyptic number.

28166973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28166973 is a deficient number, since it is larger than the sum of its proper divisors (11021955).

28166973 is a wasteful number, since it uses less digits than its factorization.

28166973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408243.

The product of its digits is 108864, while the sum is 42.

The square root of 28166973 is about 5307.2566359655. The cubic root of 28166973 is about 304.2613065191.

The spelling of 28166973 in words is "twenty-eight million, one hundred sixty-six thousand, nine hundred seventy-three".