51686870 has 8 divisors (see below), whose sum is σ = 93036384. Its totient is φ = 20674744.

The previous prime is 51686863. The next prime is 51686879. The reversal of 51686870 is 7868615.

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 (51686879) 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, 2584334 + ... + 2584353.

It is an arithmetic number, because the mean of its divisors is an integer number (11629548).

Almost surely, 2^51686870 is an apocalyptic number.

51686870 is a deficient number, since it is larger than the sum of its proper divisors (41349514).

51686870 is a wasteful number, since it uses less digits than its factorization.

51686870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5168694.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 51686870 is about 7189.3581076477. The cubic root of 51686870 is about 372.5004008824.

The spelling of 51686870 in words is "fifty-one million, six hundred eighty-six thousand, eight hundred seventy".