51360220 has 12 divisors (see below), whose sum is σ = 107856504. Its totient is φ = 20544080.

The previous prime is 51360203. The next prime is 51360223. The reversal of 51360220 is 2206315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51360223) 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, 1283986 + ... + 1284025.

It is an arithmetic number, because the mean of its divisors is an integer number (8988042).

Almost surely, 2^51360220 is an apocalyptic number.

It is an amenable number.

51360220 is an abundant number, since it is smaller than the sum of its proper divisors (56496284).

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

51360220 is a wasteful number, since it uses less digits than its factorization.

51360220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568020 (or 2568018 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51360220 is about 7166.6044958544. The cubic root of 51360220 is about 371.7140342837.

Adding to 51360220 its reverse (2206315), we get a palindrome (53566535).

The spelling of 51360220 in words is "fifty-one million, three hundred sixty thousand, two hundred twenty".