51808516 has 24 divisors (see below), whose sum is σ = 96656000. Its totient is φ = 24227424.

The previous prime is 51808511. The next prime is 51808531. The reversal of 51808516 is 61580815.

It is not an unprimeable number, because it can be changed into a prime (51808511) 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, 1690 + ... + 10318.

Almost surely, 2^51808516 is an apocalyptic number.

It is an amenable number.

51808516 is a deficient number, since it is larger than the sum of its proper divisors (44847484).

51808516 is a wasteful number, since it uses less digits than its factorization.

51808516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8731 (or 8729 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 51808516 is about 7197.8132790452. The cubic root of 51808516 is about 372.7924007765.

The spelling of 51808516 in words is "fifty-one million, eight hundred eight thousand, five hundred sixteen".