51664406 has 8 divisors (see below), whose sum is σ = 77745144. Its totient is φ = 25749360.

The previous prime is 51664381. The next prime is 51664433. The reversal of 51664406 is 60446615.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40640 + ... + 41891.

It is an arithmetic number, because the mean of its divisors is an integer number (9718143).

Almost surely, 2^51664406 is an apocalyptic number.

51664406 is a deficient number, since it is larger than the sum of its proper divisors (26080738).

51664406 is a wasteful number, since it uses less digits than its factorization.

51664406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82846.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 51664406 is about 7187.7956287029. The cubic root of 51664406 is about 372.4464280419.

The spelling of 51664406 in words is "fifty-one million, six hundred sixty-four thousand, four hundred six".