51851880 has 128 divisors (see below), whose sum is σ = 177206400. Its totient is φ = 13478400.

The previous prime is 51851869. The next prime is 51851927. The reversal of 51851880 is 8815815.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43695 + ... + 44865.

It is an arithmetic number, because the mean of its divisors is an integer number (1384425).

Almost surely, 2^51851880 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 51851880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88603200).

51851880 is an abundant number, since it is smaller than the sum of its proper divisors (125354520).

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

51851880 is a wasteful number, since it uses less digits than its factorization.

51851880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 51851880 is about 7200.8249527398. The cubic root of 51851880 is about 372.8963815036.

The spelling of 51851880 in words is "fifty-one million, eight hundred fifty-one thousand, eight hundred eighty".