51667646 has 8 divisors (see below), whose sum is σ = 77686824. Its totient is φ = 25772040.

The previous prime is 51667621. The next prime is 51667663. The reversal of 51667646 is 64676615.

51667646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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 3 ways as a sum of consecutive naturals, for example, 29840 + ... + 31523.

It is an arithmetic number, because the mean of its divisors is an integer number (9710853).

Almost surely, 2^51667646 is an apocalyptic number.

51667646 is a deficient number, since it is larger than the sum of its proper divisors (26019178).

51667646 is a wasteful number, since it uses less digits than its factorization.

51667646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61786.

The product of its digits is 181440, while the sum is 41.

The square root of 51667646 is about 7188.0210072036. The cubic root of 51667646 is about 372.4542135516.

The spelling of 51667646 in words is "fifty-one million, six hundred sixty-seven thousand, six hundred forty-six".