28911904 has 48 divisors (see below), whose sum is σ = 65415168. Its totient is φ = 12321792.

The previous prime is 28911899. The next prime is 28911919. The reversal of 28911904 is 40911982.

It is a self number, because there is not a number n which added to its sum of digits gives 28911904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75297 + ... + 75679.

It is an arithmetic number, because the mean of its divisors is an integer number (1362816).

Almost surely, 2^28911904 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 28911904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707584).

28911904 is an abundant number, since it is smaller than the sum of its proper divisors (36503264).

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

28911904 is a wasteful number, since it uses less digits than its factorization.

28911904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 28911904 is about 5376.9790775118. The cubic root of 28911904 is about 306.9202649191.

The spelling of 28911904 in words is "twenty-eight million, nine hundred eleven thousand, nine hundred four".