51386705 has 8 divisors (see below), whose sum is σ = 62675304. Its totient is φ = 40435200.

The previous prime is 51386701. The next prime is 51386707. The reversal of 51386705 is 50768315.

It can be written as a sum of positive squares in 4 ways, for example, as 135424 + 51251281 = 368^2 + 7159^2 .

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

It is not a de Polignac number, because 51386705 - 2² = 51386701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51386701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83936 + ... + 84545.

It is an arithmetic number, because the mean of its divisors is an integer number (7834413).

Almost surely, 2^51386705 is an apocalyptic number.

It is an amenable number.

51386705 is a deficient number, since it is larger than the sum of its proper divisors (11288599).

51386705 is a wasteful number, since it uses less digits than its factorization.

51386705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168547.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 51386705 is about 7168.4520644279. The cubic root of 51386705 is about 371.7779174112. Note that the first 3 decimals are identical.

The spelling of 51386705 in words is "fifty-one million, three hundred eighty-six thousand, seven hundred five".