51664268 has 12 divisors (see below), whose sum is σ = 95171160. Its totient is φ = 24472512.

The previous prime is 51664267. The next prime is 51664271. The reversal of 51664268 is 86246615.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (51664267) by changing a digit.

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, 339821 + ... + 339972.

It is an arithmetic number, because the mean of its divisors is an integer number (7930930).

Almost surely, 2^51664268 is an apocalyptic number.

It is an amenable number.

51664268 is a deficient number, since it is larger than the sum of its proper divisors (43506892).

51664268 is a wasteful number, since it uses less digits than its factorization.

51664268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679816 (or 679814 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 51664268 is about 7187.7860290913. The cubic root of 51664268 is about 372.4460964297.

The spelling of 51664268 in words is "fifty-one million, six hundred sixty-four thousand, two hundred sixty-eight".