51440266 has 12 divisors (see below), whose sum is σ = 81967158. Its totient is φ = 24206912.

The previous prime is 51440251. The next prime is 51440273. The reversal of 51440266 is 66204415.

It can be written as a sum of positive squares in 3 ways, for example, as 51337225 + 103041 = 7165^2 + 321^2 .

It is a super-2 number, since 2×51440266² = 5292201932301512, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 43921 + ... + 45076.

Almost surely, 2^51440266 is an apocalyptic number.

51440266 is a deficient number, since it is larger than the sum of its proper divisors (30526892).

51440266 is a wasteful number, since it uses less digits than its factorization.

51440266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89033 (or 89016 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 51440266 is about 7172.1869746961. The cubic root of 51440266 is about 371.9070421370.

The spelling of 51440266 in words is "fifty-one million, four hundred forty thousand, two hundred sixty-six".