51520706 has 8 divisors (see below), whose sum is σ = 78046524. Its totient is φ = 25505200.

The previous prime is 51520643. The next prime is 51520709. The reversal of 51520706 is 60702515.

It can be written as a sum of positive squares in 2 ways, for example, as 45225625 + 6295081 = 6725^2 + 2509^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51520709) 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, 127325 + ... + 127728.

Almost surely, 2^51520706 is an apocalyptic number.

51520706 is a deficient number, since it is larger than the sum of its proper divisors (26525818).

51520706 is a wasteful number, since it uses less digits than its factorization.

51520706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255156.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 51520706 is about 7177.7925576043. The cubic root of 51520706 is about 372.1007984065.

The spelling of 51520706 in words is "fifty-one million, five hundred twenty thousand, seven hundred six".