51969680 has 160 divisors (see below), whose sum is σ = 150418944. Its totient is φ = 16293888.

The previous prime is 51969679. The next prime is 51969683. The reversal of 51969680 is 8696915.

51969680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 7209²-1.

It is not an unprimeable number, because it can be changed into a prime (51969683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504509 + ... + 504611.

Almost surely, 2^51969680 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 51969680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75209472).

51969680 is an abundant number, since it is smaller than the sum of its proper divisors (98449264).

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

51969680 is a wasteful number, since it uses less digits than its factorization.

51969680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 51969680 is about 7208.9999306423. Note that the first 4 decimals coincide. The cubic root of 51969680 is about 373.1785568734.

The spelling of 51969680 in words is "fifty-one million, nine hundred sixty-nine thousand, six hundred eighty".