51338720 has 24 divisors (see below), whose sum is σ = 121288104. Its totient is φ = 20535424.

The previous prime is 51338717. The next prime is 51338731. The reversal of 51338720 is 2783315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160274 + ... + 160593.

It is an arithmetic number, because the mean of its divisors is an integer number (5053671).

Almost surely, 2^51338720 is an apocalyptic number.

It is an amenable number.

51338720 is an abundant number, since it is smaller than the sum of its proper divisors (69949384).

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

51338720 is a wasteful number, since it uses less digits than its factorization.

51338720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320882 (or 320874 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 51338720 is about 7165.1043258281. The cubic root of 51338720 is about 371.6621590700.

The spelling of 51338720 in words is "fifty-one million, three hundred thirty-eight thousand, seven hundred twenty".