28666630 has 48 divisors (see below), whose sum is σ = 56481840. Its totient is φ = 10445760.

The previous prime is 28666621. The next prime is 28666639. The reversal of 28666630 is 3666682.

It is an interprime number because it is at equal distance from previous prime (28666621) and next prime (28666639).

It is a self number, because there is not a number n which added to its sum of digits gives 28666630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182512 + ... + 182668.

It is an arithmetic number, because the mean of its divisors is an integer number (1176705).

Almost surely, 2^28666630 is an apocalyptic number.

28666630 is a deficient number, since it is larger than the sum of its proper divisors (27815210).

28666630 is a wasteful number, since it uses less digits than its factorization.

28666630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 28666630 is about 5354.1227105848. The cubic root of 28666630 is about 306.0498800884.

The spelling of 28666630 in words is "twenty-eight million, six hundred sixty-six thousand, six hundred thirty".