51987568 has 20 divisors (see below), whose sum is σ = 100857880. Its totient is φ = 25959744.

The previous prime is 51987563. The next prime is 51987569. The reversal of 51987568 is 86578915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51987563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14323 + ... + 17581.

It is an arithmetic number, because the mean of its divisors is an integer number (5042894).

Almost surely, 2^51987568 is an apocalyptic number.

It is an amenable number.

51987568 is a deficient number, since it is larger than the sum of its proper divisors (48870312).

51987568 is a wasteful number, since it uses less digits than its factorization.

51987568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264 (or 4258 counting only the distinct ones).

The product of its digits is 604800, while the sum is 49.

The square root of 51987568 is about 7210.2404952956. The cubic root of 51987568 is about 373.2213680682.

The spelling of 51987568 in words is "fifty-one million, nine hundred eighty-seven thousand, five hundred sixty-eight".