28913906 has 16 divisors (see below), whose sum is σ = 52482816. Its totient is φ = 11662656.

The previous prime is 28913903. The next prime is 28913947. The reversal of 28913906 is 60931982.

It is a self number, because there is not a number n which added to its sum of digits gives 28913906.

It is not an unprimeable number, because it can be changed into a prime (28913903) 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, 60506 + ... + 60981.

It is an arithmetic number, because the mean of its divisors is an integer number (3280176).

Almost surely, 2^28913906 is an apocalyptic number.

28913906 is a deficient number, since it is larger than the sum of its proper divisors (23568910).

28913906 is a wasteful number, since it uses less digits than its factorization.

28913906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121513.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28913906 is about 5377.1652383017. The cubic root of 28913906 is about 306.9273489699.

The spelling of 28913906 in words is "twenty-eight million, nine hundred thirteen thousand, nine hundred six".