51851580 has 96 divisors (see below), whose sum is σ = 159522048. Its totient is φ = 12480000.

The previous prime is 51851557. The next prime is 51851599. The reversal of 51851580 is 8515815.

51851580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nialpdrome in base 13.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 165504 + ... + 165816.

It is an arithmetic number, because the mean of its divisors is an integer number (1661688).

Almost surely, 2^51851580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51851580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79761024).

51851580 is an abundant number, since it is smaller than the sum of its proper divisors (107670468).

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

51851580 is a wasteful number, since it uses less digits than its factorization.

51851580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 33.

The square root of 51851580 is about 7200.8041217631. The cubic root of 51851580 is about 372.8956623453.

The spelling of 51851580 in words is "fifty-one million, eight hundred fifty-one thousand, five hundred eighty".