51705657 has 12 divisors (see below), whose sum is σ = 74760660. Its totient is φ = 34435968.

The previous prime is 51705649. The next prime is 51705659. The reversal of 51705657 is 75650715.

It can be written as a sum of positive squares in 2 ways, for example, as 39237696 + 12467961 = 6264^2 + 3531^2 .

It is not a de Polignac number, because 51705657 - 2³ = 51705649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51705659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9373 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (6230055).

Almost surely, 2^51705657 is an apocalyptic number.

It is an amenable number.

51705657 is a deficient number, since it is larger than the sum of its proper divisors (23055003).

51705657 is a wasteful number, since it uses less digits than its factorization.

51705657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752 (or 5749 counting only the distinct ones).

The product of its (nonzero) digits is 36750, while the sum is 36.

The square root of 51705657 is about 7190.6645729028. The cubic root of 51705657 is about 372.5455272192.

The spelling of 51705657 in words is "fifty-one million, seven hundred five thousand, six hundred fifty-seven".