51547320 has 128 divisors (see below), whose sum is σ = 187488000. Its totient is φ = 12493440.

The previous prime is 51547303. The next prime is 51547333. The reversal of 51547320 is 2374515.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9711 + ... + 14049.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^51547320 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 51547320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93744000).

51547320 is an abundant number, since it is smaller than the sum of its proper divisors (135940680).

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

51547320 is a wasteful number, since it uses less digits than its factorization.

51547320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370 (or 4360 counting only the distinct ones).

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

The square root of 51547320 is about 7179.6462308390. The cubic root of 51547320 is about 372.1648592906.

The spelling of 51547320 in words is "fifty-one million, five hundred forty-seven thousand, three hundred twenty".