51575866 has 8 divisors (see below), whose sum is σ = 78632244. Its totient is φ = 25365120.

The previous prime is 51575851. The next prime is 51575869. The reversal of 51575866 is 66857515.

It can be written as a sum of positive squares in 2 ways, for example, as 35343025 + 16232841 = 5945^2 + 4029^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51575869) 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, 211255 + ... + 211498.

Almost surely, 2^51575866 is an apocalyptic number.

51575866 is a deficient number, since it is larger than the sum of its proper divisors (27056378).

51575866 is a wasteful number, since it uses less digits than its factorization.

51575866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422816.

The product of its digits is 252000, while the sum is 43.

The square root of 51575866 is about 7181.6339366470. The cubic root of 51575866 is about 372.2335460661.

It can be divided in two parts, 51575 and 866, that added together give a square (52441 = 229²).

The spelling of 51575866 in words is "fifty-one million, five hundred seventy-five thousand, eight hundred sixty-six".