51522320 has 20 divisors (see below), whose sum is σ = 119789580. Its totient is φ = 20608896.

The previous prime is 51522311. The next prime is 51522329. The reversal of 51522320 is 2322515.

It is an interprime number because it is at equal distance from previous prime (51522311) and next prime (51522329).

It can be written as a sum of positive squares in 2 ways, for example, as 36529936 + 14992384 = 6044^2 + 3872^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51522292 and 51522301.

It is not an unprimeable number, because it can be changed into a prime (51522329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321935 + ... + 322094.

It is an arithmetic number, because the mean of its divisors is an integer number (5989479).

Almost surely, 2^51522320 is an apocalyptic number.

It is an amenable number.

51522320 is an abundant number, since it is smaller than the sum of its proper divisors (68267260).

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

51522320 is a wasteful number, since it uses less digits than its factorization.

51522320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644042 (or 644036 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51522320 is about 7177.9049868329. The cubic root of 51522320 is about 372.1046839926.

Adding to 51522320 its reverse (2322515), we get a palindrome (53844835).

The spelling of 51522320 in words is "fifty-one million, five hundred twenty-two thousand, three hundred twenty".