51806738 has 8 divisors (see below), whose sum is σ = 78479820. Its totient is φ = 25646800.

The previous prime is 51806723. The next prime is 51806743. The reversal of 51806738 is 83760815.

It can be written as a sum of positive squares in 2 ways, for example, as 34774609 + 17032129 = 5897^2 + 4127^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128033 + ... + 128436.

Almost surely, 2^51806738 is an apocalyptic number.

51806738 is a deficient number, since it is larger than the sum of its proper divisors (26673082).

51806738 is a wasteful number, since it uses less digits than its factorization.

51806738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256572.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 51806738 is about 7197.6897682520. The cubic root of 51806738 is about 372.7881361464.

The spelling of 51806738 in words is "fifty-one million, eight hundred six thousand, seven hundred thirty-eight".