51851520 has 216 divisors, whose sum is σ = 205348416. Its totient is φ = 11833344.

The previous prime is 51851491. The next prime is 51851521. The reversal of 51851520 is 2515815.

It is not an unprimeable number, because it can be changed into a prime (51851521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80319 + ... + 80961.

Almost surely, 2^51851520 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 51851520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102674208).

51851520 is an abundant number, since it is smaller than the sum of its proper divisors (153496896).

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

51851520 is a wasteful number, since it uses less digits than its factorization.

51851520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 660 counting only the distinct ones).

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

The square root of 51851520 is about 7200.7999555605. The cubic root of 51851520 is about 372.8955185133.

The spelling of 51851520 in words is "fifty-one million, eight hundred fifty-one thousand, five hundred twenty".