51005686 has 8 divisors (see below), whose sum is σ = 77015664. Its totient is φ = 25333800.

The previous prime is 51005683. The next prime is 51005701. The reversal of 51005686 is 68650015.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84145 + ... + 84748.

It is an arithmetic number, because the mean of its divisors is an integer number (9626958).

Almost surely, 2^51005686 is an apocalyptic number.

51005686 is a deficient number, since it is larger than the sum of its proper divisors (26009978).

51005686 is a wasteful number, since it uses less digits than its factorization.

51005686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169046.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 51005686 is about 7141.8265170753. The cubic root of 51005686 is about 370.8567581999.

The spelling of 51005686 in words is "fifty-one million, five thousand, six hundred eighty-six".