51334640 has 120 divisors (see below), whose sum is σ = 142565280. Its totient is φ = 16837632.

The previous prime is 51334609. The next prime is 51334649. The reversal of 51334640 is 4643315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51334649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 470906 + ... + 471014.

It is an arithmetic number, because the mean of its divisors is an integer number (1188044).

Almost surely, 2^51334640 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 51334640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71282640).

51334640 is an abundant number, since it is smaller than the sum of its proper divisors (91230640).

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

51334640 is a wasteful number, since it uses less digits than its factorization.

51334640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 51334640 is about 7164.8196069406. The cubic root of 51334640 is about 371.6523132085.

Adding to 51334640 its reverse (4643315), we get a palindrome (55977955).

It can be divided in two parts, 513 and 34640, that added together give a palindrome (35153).

The spelling of 51334640 in words is "fifty-one million, three hundred thirty-four thousand, six hundred forty".