28913144 has 32 divisors (see below), whose sum is σ = 58756320. Its totient is φ = 13259136.

The previous prime is 28913123. The next prime is 28913149. The reversal of 28913144 is 44131982.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28913144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28913149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17189 + ... + 18795.

It is an arithmetic number, because the mean of its divisors is an integer number (1836135).

Almost surely, 2^28913144 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 28913144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29378160).

28913144 is an abundant number, since it is smaller than the sum of its proper divisors (29843176).

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

28913144 is a wasteful number, since it uses less digits than its factorization.

28913144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1795 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 28913144 is about 5377.0943826569. The cubic root of 28913144 is about 306.9246526814.

The spelling of 28913144 in words is "twenty-eight million, nine hundred thirteen thousand, one hundred forty-four".