51743240 has 64 divisors (see below), whose sum is σ = 125971200. Its totient is φ = 19053568.

The previous prime is 51743231. The next prime is 51743243. The reversal of 51743240 is 4234715.

It is not an unprimeable number, because it can be changed into a prime (51743243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31151 + ... + 32769.

It is an arithmetic number, because the mean of its divisors is an integer number (1968300).

Almost surely, 2^51743240 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 51743240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62985600).

51743240 is an abundant number, since it is smaller than the sum of its proper divisors (74227960).

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

51743240 is a wasteful number, since it uses less digits than its factorization.

51743240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1690 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 51743240 is about 7193.2774171444. The cubic root of 51743240 is about 372.6357687154.

Adding to 51743240 its reverse (4234715), we get a palindrome (55977955).

The spelling of 51743240 in words is "fifty-one million, seven hundred forty-three thousand, two hundred forty".