28743104 has 56 divisors (see below), whose sum is σ = 62087760. Its totient is φ = 13123584.

The previous prime is 28743083. The next prime is 28743131. The reversal of 28743104 is 40134782.

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, 148832 + ... + 149024.

It is an arithmetic number, because the mean of its divisors is an integer number (1108710).

Almost surely, 2^28743104 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 28743104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31043880).

28743104 is an abundant number, since it is smaller than the sum of its proper divisors (33344656).

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

28743104 is a wasteful number, since it uses less digits than its factorization.

28743104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 28743104 is about 5361.2595535005. The cubic root of 28743104 is about 306.3217883075.

Adding to 28743104 its reverse (40134782), we get a palindrome (68877886).

The spelling of 28743104 in words is "twenty-eight million, seven hundred forty-three thousand, one hundred four".