51864466 has 4 divisors (see below), whose sum is σ = 77796702. Its totient is φ = 25932232.

The previous prime is 51864443. The next prime is 51864469. The reversal of 51864466 is 66446815.

It is a happy number.

51864466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 32319225 + 19545241 = 5685^2 + 4421^2 .

It is not an unprimeable number, because it can be changed into a prime (51864469) 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 as a sum of consecutive naturals, namely, 12966115 + ... + 12966118.

Almost surely, 2^51864466 is an apocalyptic number.

51864466 is a deficient number, since it is larger than the sum of its proper divisors (25932236).

51864466 is a wasteful number, since it uses less digits than its factorization.

51864466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25932235.

The product of its digits is 138240, while the sum is 40.

The square root of 51864466 is about 7201.6988273601. The cubic root of 51864466 is about 372.9265500926.

The spelling of 51864466 in words is "fifty-one million, eight hundred sixty-four thousand, four hundred sixty-six".