28918912 has 128 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 11658240.

The previous prime is 28918907. The next prime is 28918933. The reversal of 28918912 is 21981982.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615273 + ... + 615319.

It is an arithmetic number, because the mean of its divisors is an integer number (550800).

Almost surely, 2^28918912 is an apocalyptic number.

28918912 is a gapful number since it is divisible by the number (22) 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 28918912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35251200).

28918912 is an abundant number, since it is smaller than the sum of its proper divisors (41583488).

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

28918912 is a wasteful number, since it uses less digits than its factorization.

28918912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 102 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 28918912 is about 5377.6307050596. The cubic root of 28918912 is about 306.9450612043.

The spelling of 28918912 in words is "twenty-eight million, nine hundred eighteen thousand, nine hundred twelve".