28135744 has 56 divisors (see below), whose sum is σ = 68730368. Its totient is φ = 11128320.

The previous prime is 28135729. The next prime is 28135747. The reversal of 28135744 is 44753182.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135747) 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, 3409 + ... + 8239.

It is an arithmetic number, because the mean of its divisors is an integer number (1227328).

Almost surely, 2^28135744 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 28135744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34365184).

28135744 is an abundant number, since it is smaller than the sum of its proper divisors (40594624).

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

28135744 is a wasteful number, since it uses less digits than its factorization.

28135744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4863 (or 4853 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 28135744 is about 5304.3137162125. The cubic root of 28135744 is about 304.1488191025.

The spelling of 28135744 in words is "twenty-eight million, one hundred thirty-five thousand, seven hundred forty-four".