51558120 has 80 divisors (see below), whose sum is σ = 173303460. Its totient is φ = 13747968.

The previous prime is 51558109. The next prime is 51558139. The reversal of 51558120 is 2185515.

51558120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51065316 + 492804 = 7146^2 + 702^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4717 + ... + 11196.

Almost surely, 2^51558120 is an apocalyptic number.

It is an amenable number.

51558120 is an abundant number, since it is smaller than the sum of its proper divisors (121745340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51558120 is a wasteful number, since it uses less digits than its factorization.

51558120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15936 (or 15923 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 51558120 is about 7180.3983176423. The cubic root of 51558120 is about 372.1908490013.

The spelling of 51558120 in words is "fifty-one million, five hundred fifty-eight thousand, one hundred twenty".