51745740 has 72 divisors (see below), whose sum is σ = 152979120. Its totient is φ = 13067136.

The previous prime is 51745693. The next prime is 51745741. The reversal of 51745740 is 4754715.

51745740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51745741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20466 + ... + 22854.

It is an arithmetic number, because the mean of its divisors is an integer number (2124710).

Almost surely, 2^51745740 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 51745740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76489560).

51745740 is an abundant number, since it is smaller than the sum of its proper divisors (101233380).

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

51745740 is a wasteful number, since it uses less digits than its factorization.

51745740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 33.

The square root of 51745740 is about 7193.4511884074. The cubic root of 51745740 is about 372.6417699787.

Subtracting from 51745740 its reverse (4754715), we obtain a square (46991025 = 6855²).

The spelling of 51745740 in words is "fifty-one million, seven hundred forty-five thousand, seven hundred forty".