51744540 has 24 divisors (see below), whose sum is σ = 144884880. Its totient is φ = 13798528.

The previous prime is 51744533. The next prime is 51744541. The reversal of 51744540 is 4544715.

51744540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51744498 and 51744507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51744541) 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 7 ways as a sum of consecutive naturals, for example, 431145 + ... + 431264.

It is an arithmetic number, because the mean of its divisors is an integer number (6036870).

Almost surely, 2^51744540 is an apocalyptic number.

It is an amenable number.

51744540 is an abundant number, since it is smaller than the sum of its proper divisors (93140340).

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

51744540 is a wasteful number, since it uses less digits than its factorization.

51744540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862421 (or 862419 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 51744540 is about 7193.3677787251. The cubic root of 51744540 is about 372.6388893965.

The spelling of 51744540 in words is "fifty-one million, seven hundred forty-four thousand, five hundred forty".