51337440 has 288 divisors, whose sum is σ = 218889216. Its totient is φ = 10644480.

The previous prime is 51337397. The next prime is 51337441. The reversal of 51337440 is 4473315.

51337440 = 939² + 940² + ... + 993².

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51337441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110649 + ... + 111111.

It is an arithmetic number, because the mean of its divisors is an integer number (760032).

Almost surely, 2^51337440 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 51337440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109444608).

51337440 is an abundant number, since it is smaller than the sum of its proper divisors (167551776).

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

51337440 is a wasteful number, since it uses less digits than its factorization.

51337440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 51337440 is about 7165.0150034735. The cubic root of 51337440 is about 371.6590702284.

The spelling of 51337440 in words is "fifty-one million, three hundred thirty-seven thousand, four hundred forty".