28758805 has 8 divisors (see below), whose sum is σ = 35443512. Its totient is φ = 22385088.

The previous prime is 28758803. The next prime is 28758817. The reversal of 28758805 is 50885782.

It can be written as a sum of positive squares in 4 ways, for example, as 4384836 + 24373969 = 2094^2 + 4937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28758805 - 2¹ = 28758803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28758803) 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, 77542 + ... + 77911.

It is an arithmetic number, because the mean of its divisors is an integer number (4430439).

Almost surely, 2^28758805 is an apocalyptic number.

It is an amenable number.

28758805 is a deficient number, since it is larger than the sum of its proper divisors (6684707).

28758805 is a wasteful number, since it uses less digits than its factorization.

28758805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155495.

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 28758805 is about 5362.7236550096. The cubic root of 28758805 is about 306.3775545291.

The spelling of 28758805 in words is "twenty-eight million, seven hundred fifty-eight thousand, eight hundred five".