28509166 has 32 divisors (see below), whose sum is σ = 51305472. Its totient is φ = 11625120.

The previous prime is 28509163. The next prime is 28509197. The reversal of 28509166 is 66190582.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28509163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23761 + ... + 24931.

It is an arithmetic number, because the mean of its divisors is an integer number (1603296).

Almost surely, 2^28509166 is an apocalyptic number.

28509166 is a deficient number, since it is larger than the sum of its proper divisors (22796306).

28509166 is a wasteful number, since it uses less digits than its factorization.

28509166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28509166 is about 5339.3975315573. The cubic root of 28509166 is about 305.4884799886.

The spelling of 28509166 in words is "twenty-eight million, five hundred nine thousand, one hundred sixty-six".