51696040 has 64 divisors (see below), whose sum is σ = 128070720. Its totient is φ = 18779200.

The previous prime is 51695989. The next prime is 51696049. The reversal of 51696040 is 4069615.

It is a junction number, because it is equal to n+sod(n) for n = 51695993 and 51696011.

It is not an unprimeable number, because it can be changed into a prime (51696049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52755 + ... + 53725.

It is an arithmetic number, because the mean of its divisors is an integer number (2001105).

Almost surely, 2^51696040 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 51696040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64035360).

51696040 is an abundant number, since it is smaller than the sum of its proper divisors (76374680).

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

51696040 is a wasteful number, since it uses less digits than its factorization.

51696040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51696040 is about 7189.9958275370. The cubic root of 51696040 is about 372.5224285701.

The spelling of 51696040 in words is "fifty-one million, six hundred ninety-six thousand, forty".