51568816 has 40 divisors (see below), whose sum is σ = 110242944. Its totient is φ = 23216640.

The previous prime is 51568801. The next prime is 51568817. The reversal of 51568816 is 61886515.

It is not an unprimeable number, because it can be changed into a prime (51568817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5505 + ... + 11551.

Almost surely, 2^51568816 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 51568816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55121472).

51568816 is an abundant number, since it is smaller than the sum of its proper divisors (58674128).

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

51568816 is a wasteful number, since it uses less digits than its factorization.

51568816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109 (or 6103 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 51568816 is about 7181.1430844957. The cubic root of 51568816 is about 372.2165848638.

The spelling of 51568816 in words is "fifty-one million, five hundred sixty-eight thousand, eight hundred sixteen".