28725166 has 4 divisors (see below), whose sum is σ = 43087752. Its totient is φ = 14362582.

The previous prime is 28725149. The next prime is 28725181. The reversal of 28725166 is 66152782.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7181290 + ... + 7181293.

It is an arithmetic number, because the mean of its divisors is an integer number (10771938).

Almost surely, 2^28725166 is an apocalyptic number.

28725166 is a deficient number, since it is larger than the sum of its proper divisors (14362586).

28725166 is a wasteful number, since it uses less digits than its factorization.

28725166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14362585.

The product of its digits is 40320, while the sum is 37.

The square root of 28725166 is about 5359.5863646367. The cubic root of 28725166 is about 306.2580519332.

The spelling of 28725166 in words is "twenty-eight million, seven hundred twenty-five thousand, one hundred sixty-six".