28666629 has 20 divisors (see below), whose sum is σ = 42967584. Its totient is φ = 19046664.

The previous prime is 28666621. The next prime is 28666639. The reversal of 28666629 is 92666682.

It is not a de Polignac number, because 28666629 - 2³ = 28666621 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666621) 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 19 ways as a sum of consecutive naturals, for example, 43984 + ... + 44630.

Almost surely, 2^28666629 is an apocalyptic number.

It is an amenable number.

28666629 is a deficient number, since it is larger than the sum of its proper divisors (14300955).

28666629 is an equidigital number, since it uses as much as digits as its factorization.

28666629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206 (or 1197 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 28666629 is about 5354.1226171988. The cubic root of 28666629 is about 306.0498765297.

The spelling of 28666629 in words is "twenty-eight million, six hundred sixty-six thousand, six hundred twenty-nine".