866525728 has 24 divisors (see below), whose sum is σ = 1708450380. Its totient is φ = 432633600.

The previous prime is 866525711. The next prime is 866525749. The reversal of 866525728 is 827525668.

It can be written as a sum of positive squares in 2 ways, for example, as 856615824 + 9909904 = 29268^2 + 3148^2 .

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 3 ways as a sum of consecutive naturals, for example, 3118 + ... + 41746.

Almost surely, 2^866525728 is an apocalyptic number.

It is an amenable number.

866525728 is a deficient number, since it is larger than the sum of its proper divisors (841924652).

866525728 is a wasteful number, since it uses less digits than its factorization.

866525728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39340 (or 39332 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The square root of 866525728 is about 29436.8090662015. The cubic root of 866525728 is about 953.3678170105.

The spelling of 866525728 in words is "eight hundred sixty-six million, five hundred twenty-five thousand, seven hundred twenty-eight".