28395757 has 8 divisors (see below), whose sum is σ = 31157784. Its totient is φ = 25716288.

The previous prime is 28395751. The next prime is 28395769. The reversal of 28395757 is 75759382.

It can be written as a sum of positive squares in 4 ways, for example, as 11634921 + 16760836 = 3411^2 + 4094^2 .

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

It is not a de Polignac number, because 28395757 - 2³ = 28395749 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 (28395751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19918 + ... + 21295.

It is an arithmetic number, because the mean of its divisors is an integer number (3894723).

Almost surely, 2^28395757 is an apocalyptic number.

It is an amenable number.

28395757 is a deficient number, since it is larger than the sum of its proper divisors (2762027).

28395757 is a wasteful number, since it uses less digits than its factorization.

28395757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41279.

The product of its digits is 529200, while the sum is 46.

The square root of 28395757 is about 5328.7669305384. The cubic root of 28395757 is about 305.0828655967.

The spelling of 28395757 in words is "twenty-eight million, three hundred ninety-five thousand, seven hundred fifty-seven".