51407220 has 24 divisors (see below), whose sum is σ = 143940384. Its totient is φ = 13708576.

The previous prime is 51407183. The next prime is 51407243. The reversal of 51407220 is 2270415.

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 7 ways as a sum of consecutive naturals, for example, 428334 + ... + 428453.

It is an arithmetic number, because the mean of its divisors is an integer number (5997516).

Almost surely, 2^51407220 is an apocalyptic number.

It is an amenable number.

51407220 is an abundant number, since it is smaller than the sum of its proper divisors (92533164).

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

51407220 is a wasteful number, since it uses less digits than its factorization.

51407220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856799 (or 856797 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 51407220 is about 7169.8828442311. The cubic root of 51407220 is about 371.8273855192.

Adding to 51407220 its reverse (2270415), we get a palindrome (53677635).

The spelling of 51407220 in words is "fifty-one million, four hundred seven thousand, two hundred twenty".