51740640 has 384 divisors, whose sum is σ = 217728000. Its totient is φ = 11225088.

The previous prime is 51740617. The next prime is 51740641. The reversal of 51740640 is 4604715.

51740640 is a `hidden beast` number, since 5 + 17 + 4 + 0 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51740641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 876931 + ... + 876989.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^51740640 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 51740640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108864000).

51740640 is an abundant number, since it is smaller than the sum of its proper divisors (165987360).

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

51740640 is a wasteful number, since it uses less digits than its factorization.

51740640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51740640 is about 7193.0966905777. The cubic root of 51740640 is about 372.6295271966.

The spelling of 51740640 in words is "fifty-one million, seven hundred forty thousand, six hundred forty".