28129666 has 16 divisors (see below), whose sum is σ = 43142400. Its totient is φ = 13751568.

The previous prime is 28129663. The next prime is 28129687. The reversal of 28129666 is 66692182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28129663) 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, 25780 + ... + 26848.

It is an arithmetic number, because the mean of its divisors is an integer number (2696400).

Almost surely, 2^28129666 is an apocalyptic number.

28129666 is a deficient number, since it is larger than the sum of its proper divisors (15012734).

28129666 is a wasteful number, since it uses less digits than its factorization.

28129666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353.

The product of its digits is 62208, while the sum is 40.

The square root of 28129666 is about 5303.7407553537. The cubic root of 28129666 is about 304.1269163625.

The spelling of 28129666 in words is "twenty-eight million, one hundred twenty-nine thousand, six hundred sixty-six".