51985368 has 128 divisors (see below), whose sum is σ = 155520000. Its totient is φ = 16039296.

The previous prime is 51985361. The next prime is 51985379. The reversal of 51985368 is 86358915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51985361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217393 + ... + 217631.

It is an arithmetic number, because the mean of its divisors is an integer number (1215000).

Almost surely, 2^51985368 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 51985368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77760000).

51985368 is an abundant number, since it is smaller than the sum of its proper divisors (103534632).

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

51985368 is a wasteful number, since it uses less digits than its factorization.

51985368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 316 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51985368 is about 7210.0879328896. The cubic root of 51985368 is about 373.2161033570.

The spelling of 51985368 in words is "fifty-one million, nine hundred eighty-five thousand, three hundred sixty-eight".