51069568 has 128 divisors (see below), whose sum is σ = 123379200. Its totient is φ = 20782080.

The previous prime is 51069553. The next prime is 51069593. The reversal of 51069568 is 86596015.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 51069568.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615255 + ... + 615337.

It is an arithmetic number, because the mean of its divisors is an integer number (963900).

Almost surely, 2^51069568 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 51069568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61689600).

51069568 is an abundant number, since it is smaller than the sum of its proper divisors (72309632).

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

51069568 is a wasteful number, since it uses less digits than its factorization.

51069568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 51069568 is about 7146.2975029032. The cubic root of 51069568 is about 371.0115199499.

The spelling of 51069568 in words is "fifty-one million, sixty-nine thousand, five hundred sixty-eight".