51744140 has 48 divisors (see below), whose sum is σ = 125126400. Its totient is φ = 17606592.

The previous prime is 51744103. The next prime is 51744151. The reversal of 51744140 is 4144715.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18131 + ... + 20789.

It is an arithmetic number, because the mean of its divisors is an integer number (2606800).

Almost surely, 2^51744140 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 51744140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62563200).

51744140 is an abundant number, since it is smaller than the sum of its proper divisors (73382260).

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

51744140 is a wasteful number, since it uses less digits than its factorization.

51744140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814 (or 2812 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 51744140 is about 7193.3399752827. The cubic root of 51744140 is about 372.6379291925.

Adding to 51744140 its reverse (4144715), we get a palindrome (55888855).

The spelling of 51744140 in words is "fifty-one million, seven hundred forty-four thousand, one hundred forty".