28705908 has 96 divisors (see below), whose sum is σ = 85413888. Its totient is φ = 7286400.

The previous prime is 28705891. The next prime is 28705921. The reversal of 28705908 is 80950782.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 43098 + ... + 43758.

It is an arithmetic number, because the mean of its divisors is an integer number (889728).

Almost surely, 2^28705908 is an apocalyptic number.

28705908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28705908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42706944).

28705908 is an abundant number, since it is smaller than the sum of its proper divisors (56707980).

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

28705908 is a wasteful number, since it uses less digits than its factorization.

28705908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 28705908 is about 5357.7894695481. The cubic root of 28705908 is about 306.1895958613.

It can be divided in two parts, 2870 and 5908, that added together give a palindrome (8778).

The spelling of 28705908 in words is "twenty-eight million, seven hundred five thousand, nine hundred eight".