51687936 has 80 divisors (see below), whose sum is σ = 153040800. Its totient is φ = 17224704.

The previous prime is 51687919. The next prime is 51687949. The reversal of 51687936 is 63978615.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51687891 and 51687900.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11955 + ... + 15693.

It is an arithmetic number, because the mean of its divisors is an integer number (1913010).

Almost surely, 2^51687936 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 51687936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76520400).

51687936 is an abundant number, since it is smaller than the sum of its proper divisors (101352864).

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

51687936 is an equidigital number, since it uses as much as digits as its factorization.

51687936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766 (or 3744 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 51687936 is about 7189.4322446213. The cubic root of 51687936 is about 372.5029617049.

The spelling of 51687936 in words is "fifty-one million, six hundred eighty-seven thousand, nine hundred thirty-six".