51002320 has 20 divisors (see below), whose sum is σ = 118580580. Its totient is φ = 20400896.

The previous prime is 51002269. The next prime is 51002323. The reversal of 51002320 is 2320015.

It can be written as a sum of positive squares in 2 ways, for example, as 28987456 + 22014864 = 5384^2 + 4692^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 51002320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51002323) 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, 318685 + ... + 318844.

It is an arithmetic number, because the mean of its divisors is an integer number (5929029).

Almost surely, 2^51002320 is an apocalyptic number.

It is an amenable number.

51002320 is an abundant number, since it is smaller than the sum of its proper divisors (67578260).

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

51002320 is a wasteful number, since it uses less digits than its factorization.

51002320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637542 (or 637536 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 51002320 is about 7141.5908591854. The cubic root of 51002320 is about 370.8486000813.

Adding to 51002320 its reverse (2320015), we get a palindrome (53322335).

The spelling of 51002320 in words is "fifty-one million, two thousand, three hundred twenty".