51685888 has 60 divisors (see below), whose sum is σ = 108673290. Its totient is φ = 24528896.

The previous prime is 51685883. The next prime is 51685891. The reversal of 51685888 is 88858615.

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 8020224 = 6608^2 + 2832^2 .

It is not an unprimeable number, because it can be changed into a prime (51685883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 876003 + ... + 876061.

Almost surely, 2^51685888 is an apocalyptic number.

51685888 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51685888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54336645).

51685888 is an abundant number, since it is smaller than the sum of its proper divisors (56987402).

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

51685888 is an frugal number, since it uses more digits than its factorization.

51685888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 90 counting only the distinct ones).

The product of its digits is 614400, while the sum is 49.

The square root of 51685888 is about 7189.2898119355. The cubic root of 51685888 is about 372.4980418197.

The spelling of 51685888 in words is "fifty-one million, six hundred eighty-five thousand, eight hundred eighty-eight".