51534720 has 192 divisors, whose sum is σ = 186170400. Its totient is φ = 13111296.

The previous prime is 51534719. The next prime is 51534727. The reversal of 51534720 is 2743515.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51534727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132286 + ... + 132674.

Almost surely, 2^51534720 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 51534720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93085200).

51534720 is an abundant number, since it is smaller than the sum of its proper divisors (134635680).

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

51534720 is a wasteful number, since it uses less digits than its factorization.

51534720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51534720 is about 7178.7686966499. The cubic root of 51534720 is about 372.1345333729.

The spelling of 51534720 in words is "fifty-one million, five hundred thirty-four thousand, seven hundred twenty".