51140320 has 144 divisors (see below), whose sum is σ = 153579888. Its totient is φ = 15912960.

The previous prime is 51140317. The next prime is 51140333. The reversal of 51140320 is 2304115.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 51140294 and 51140303.

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 23 ways as a sum of consecutive naturals, for example, 85944 + ... + 86536.

It is an arithmetic number, because the mean of its divisors is an integer number (1066527).

Almost surely, 2^51140320 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 51140320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76789944).

51140320 is an abundant number, since it is smaller than the sum of its proper divisors (102439568).

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

51140320 is a wasteful number, since it uses less digits than its factorization.

51140320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51140320 is about 7151.2460452707. The cubic root of 51140320 is about 371.1827745425.

Adding to 51140320 its reverse (2304115), we get a palindrome (53444435).

The spelling of 51140320 in words is "fifty-one million, one hundred forty thousand, three hundred twenty".