51858706 has 4 divisors (see below), whose sum is σ = 77788062. Its totient is φ = 25929352.

The previous prime is 51858701. The next prime is 51858707. The reversal of 51858706 is 60785815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51710481 + 148225 = 7191^2 + 385^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51858701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12964675 + ... + 12964678.

Almost surely, 2^51858706 is an apocalyptic number.

51858706 is a deficient number, since it is larger than the sum of its proper divisors (25929356).

51858706 is a wasteful number, since it uses less digits than its factorization.

51858706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25929355.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 51858706 is about 7201.2989106133. The cubic root of 51858706 is about 372.9127440027.

The spelling of 51858706 in words is "fifty-one million, eight hundred fifty-eight thousand, seven hundred six".