51666672 has 40 divisors (see below), whose sum is σ = 141325776. Its totient is φ = 16208896.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666672 is 27666615.

51666672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51666672.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 30843 + ... + 32474.

Almost surely, 2^51666672 is an apocalyptic number.

It is an amenable number.

51666672 is an abundant number, since it is smaller than the sum of its proper divisors (89659104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51666672 is a wasteful number, since it uses less digits than its factorization.

51666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63345 (or 63339 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 51666672 is about 7187.9532552737. The cubic root of 51666672 is about 372.4518731271.

The spelling of 51666672 in words is "fifty-one million, six hundred sixty-six thousand, six hundred seventy-two".