28705896 has 24 divisors (see below), whose sum is σ = 77745330. Its totient is φ = 9568608.

The previous prime is 28705891. The next prime is 28705921. The reversal of 28705896 is 69850782.

It can be written as a sum of positive squares in only one way, i.e., 28196100 + 509796 = 5310^2 + 714^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28705891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199275 + ... + 199418.

Almost surely, 2^28705896 is an apocalyptic number.

It is an amenable number.

28705896 is an abundant number, since it is smaller than the sum of its proper divisors (49039434).

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

28705896 is a wasteful number, since it uses less digits than its factorization.

28705896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398705 (or 398698 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28705896 is about 5357.7883496831. The cubic root of 28705896 is about 306.1895531956.

The spelling of 28705896 in words is "twenty-eight million, seven hundred five thousand, eight hundred ninety-six".