51808704 has 56 divisors (see below), whose sum is σ = 138062208. Its totient is φ = 17145600.

The previous prime is 51808697. The next prime is 51808709. The reversal of 51808704 is 40780815.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51808709) 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, 28099 + ... + 29885.

Almost surely, 2^51808704 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 51808704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69031104).

51808704 is an abundant number, since it is smaller than the sum of its proper divisors (86253504).

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

51808704 is a wasteful number, since it uses less digits than its factorization.

51808704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 51808704 is about 7197.8263385553. The cubic root of 51808704 is about 372.7928516991.

The spelling of 51808704 in words is "fifty-one million, eight hundred eight thousand, seven hundred four".