51806745 has 24 divisors (see below), whose sum is σ = 91143936. Its totient is φ = 27216288.

The previous prime is 51806743. The next prime is 51806767. The reversal of 51806745 is 54760815.

It is not a de Polignac number, because 51806745 - 2¹ = 51806743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51806743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5577 + ... + 11606.

It is an arithmetic number, because the mean of its divisors is an integer number (3797664).

Almost surely, 2^51806745 is an apocalyptic number.

It is an amenable number.

51806745 is a deficient number, since it is larger than the sum of its proper divisors (39337191).

51806745 is a wasteful number, since it uses less digits than its factorization.

51806745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17261 (or 17258 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 51806745 is about 7197.6902545192. The cubic root of 51806745 is about 372.7881529365.

The spelling of 51806745 in words is "fifty-one million, eight hundred six thousand, seven hundred forty-five".