28408338 has 72 divisors (see below), whose sum is σ = 73981440. Its totient is φ = 7847280.

The previous prime is 28408333. The next prime is 28408349. The reversal of 28408338 is 83380482.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28408333) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26823 + ... + 27861.

It is an arithmetic number, because the mean of its divisors is an integer number (1027520).

Almost surely, 2^28408338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28408338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36990720).

28408338 is an abundant number, since it is smaller than the sum of its proper divisors (45573102).

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

28408338 is a wasteful number, since it uses less digits than its factorization.

28408338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28408338 is about 5329.9472792890. The cubic root of 28408338 is about 305.1279155293.

The spelling of 28408338 in words is "twenty-eight million, four hundred eight thousand, three hundred thirty-eight".