51559980 has 48 divisors (see below), whose sum is σ = 152863200. Its totient is φ = 12940288.

The previous prime is 51559961. The next prime is 51560009. The reversal of 51559980 is 8995515.

It is a happy number.

51559980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 24255 + ... + 26294.

It is an arithmetic number, because the mean of its divisors is an integer number (3184650).

Almost surely, 2^51559980 is an apocalyptic number.

It is an amenable number.

51559980 is an abundant number, since it is smaller than the sum of its proper divisors (101303220).

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

51559980 is a wasteful number, since it uses less digits than its factorization.

51559980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50578 (or 50576 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 51559980 is about 7180.5278357514. The cubic root of 51559980 is about 372.1953246407.

The spelling of 51559980 in words is "fifty-one million, five hundred fifty-nine thousand, nine hundred eighty".