28408728 has 16 divisors (see below), whose sum is σ = 71021880. Its totient is φ = 9469568.

The previous prime is 28408691. The next prime is 28408729. The reversal of 28408728 is 82780482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28408729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591825 + ... + 591872.

Almost surely, 2^28408728 is an apocalyptic number.

It is an amenable number.

28408728 is an abundant number, since it is smaller than the sum of its proper divisors (42613152).

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

28408728 is a wasteful number, since it uses less digits than its factorization.

28408728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183706 (or 1183702 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28408728 is about 5329.9838648911. The cubic root of 28408728 is about 305.1293118252.

The spelling of 28408728 in words is "twenty-eight million, four hundred eight thousand, seven hundred twenty-eight".