28788906 has 16 divisors (see below), whose sum is σ = 57999744. Its totient is φ = 9525984.

The previous prime is 28788901. The next prime is 28788913. The reversal of 28788906 is 60988782.

It is a happy number.

It is a super-2 number, since 2×28788906² = 1657602217353672, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28788901) 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 7 ways as a sum of consecutive naturals, for example, 16690 + ... + 18333.

It is an arithmetic number, because the mean of its divisors is an integer number (3624984).

Almost surely, 2^28788906 is an apocalyptic number.

28788906 is an abundant number, since it is smaller than the sum of its proper divisors (29210838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28788906 is a wasteful number, since it uses less digits than its factorization.

28788906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35165.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 28788906 is about 5365.5294240177. The cubic root of 28788906 is about 306.4844093987.

The spelling of 28788906 in words is "twenty-eight million, seven hundred eighty-eight thousand, nine hundred six".