51688516 has 12 divisors (see below), whose sum is σ = 98678160. Its totient is φ = 23494760.

The previous prime is 51688513. The next prime is 51688523. The reversal of 51688516 is 61588615.

It is not an unprimeable number, because it can be changed into a prime (51688513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587326 + ... + 587413.

It is an arithmetic number, because the mean of its divisors is an integer number (8223180).

Almost surely, 2^51688516 is an apocalyptic number.

It is an amenable number.

51688516 is a deficient number, since it is larger than the sum of its proper divisors (46989644).

51688516 is a wasteful number, since it uses less digits than its factorization.

51688516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174754 (or 1174752 counting only the distinct ones).

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

The square root of 51688516 is about 7189.4725814902. The cubic root of 51688516 is about 372.5043550082.

Subtracting 51688516 from its reverse (61588615), we obtain a palindrome (9900099).

The spelling of 51688516 in words is "fifty-one million, six hundred eighty-eight thousand, five hundred sixteen".