51704857 has 4 divisors (see below), whose sum is σ = 51729700. Its totient is φ = 51680016.

The previous prime is 51704819. The next prime is 51704911. The reversal of 51704857 is 75840715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75840715 = 5 ⋅15168143.

It can be written as a sum of positive squares in 2 ways, for example, as 37687321 + 14017536 = 6139^2 + 3744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51704857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51704057) 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, 8982 + ... + 13567.

It is an arithmetic number, because the mean of its divisors is an integer number (12932425).

Almost surely, 2^51704857 is an apocalyptic number.

51704857 is the 4152-nd hex number.

It is an amenable number.

51704857 is a deficient number, since it is larger than the sum of its proper divisors (24843).

51704857 is a wasteful number, since it uses less digits than its factorization.

51704857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24842.

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 51704857 is about 7190.6089450060. The cubic root of 51704857 is about 372.5436058436.

The spelling of 51704857 in words is "fifty-one million, seven hundred four thousand, eight hundred fifty-seven".