51338840 has 64 divisors (see below), whose sum is σ = 132874560. Its totient is φ = 17487360.

The previous prime is 51338839. The next prime is 51338857. The reversal of 51338840 is 4883315.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51338797 and 51338806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50174 + ... + 51186.

It is an arithmetic number, because the mean of its divisors is an integer number (2076165).

Almost surely, 2^51338840 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 51338840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66437280).

51338840 is an abundant number, since it is smaller than the sum of its proper divisors (81535720).

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

51338840 is a wasteful number, since it uses less digits than its factorization.

51338840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 51338840 is about 7165.1126997417. The cubic root of 51338840 is about 371.6624486463.

The spelling of 51338840 in words is "fifty-one million, three hundred thirty-eight thousand, eight hundred forty".