51338538 has 72 divisors (see below), whose sum is σ = 120687840. Its totient is φ = 15765120.

The previous prime is 51338537. The next prime is 51338561. The reversal of 51338538 is 83583315.

It is not an unprimeable number, because it can be changed into a prime (51338533) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 369273 + ... + 369411.

It is an arithmetic number, because the mean of its divisors is an integer number (1676220).

Almost surely, 2^51338538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51338538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60343920).

51338538 is an abundant number, since it is smaller than the sum of its proper divisors (69349302).

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

51338538 is a wasteful number, since it uses less digits than its factorization.

51338538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 232 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 51338538 is about 7165.0916253737. The cubic root of 51338538 is about 371.6617198785.

The spelling of 51338538 in words is "fifty-one million, three hundred thirty-eight thousand, five hundred thirty-eight".