28408896 has 168 divisors, whose sum is σ = 88335104. Its totient is φ = 8709120.

The previous prime is 28408883. The next prime is 28408907. The reversal of 28408896 is 69880482.

It is a happy number.

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 28408896 = 68³ + 304³ = 152³ + 292³.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660651 + ... + 660693.

Almost surely, 2^28408896 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 28408896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44167552).

28408896 is an abundant number, since it is smaller than the sum of its proper divisors (59926208).

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

28408896 is a wasteful number, since it uses less digits than its factorization.

28408896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 28408896 is about 5329.9996247655. Note that the first 3 decimals coincide. The cubic root of 28408896 is about 305.1299133026.

The spelling of 28408896 in words is "twenty-eight million, four hundred eight thousand, eight hundred ninety-six".