28981908 has 48 divisors (see below), whose sum is σ = 75765760. Its totient is φ = 9580032.

The previous prime is 28981907. The next prime is 28981943. The reversal of 28981908 is 80918982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28981907) 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 15 ways as a sum of consecutive naturals, for example, 12660 + ... + 14772.

Almost surely, 2^28981908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28981908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37882880).

28981908 is an abundant number, since it is smaller than the sum of its proper divisors (46783852).

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

28981908 is a wasteful number, since it uses less digits than its factorization.

28981908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 2245 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28981908 is about 5383.4847450327. The cubic root of 28981908 is about 307.1677792134.

The spelling of 28981908 in words is "twenty-eight million, nine hundred eighty-one thousand, nine hundred eight".