28707866 has 32 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 12064000.

The previous prime is 28707863. The next prime is 28707869. The reversal of 28707866 is 66870782.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28707863) and next prime (28707869).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28707863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21416 + ... + 22716.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^28707866 is an apocalyptic number.

28707866 is a deficient number, since it is larger than the sum of its proper divisors (21913894).

28707866 is a wasteful number, since it uses less digits than its factorization.

28707866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 28707866 is about 5357.9721910439. The cubic root of 28707866 is about 306.1965573272.

The spelling of 28707866 in words is "twenty-eight million, seven hundred seven thousand, eight hundred sixty-six".