51220304 has 20 divisors (see below), whose sum is σ = 100601076. Its totient is φ = 25258752.

The previous prime is 51220291. The next prime is 51220307. The reversal of 51220304 is 40302215.

It can be written as a sum of positive squares in 2 ways, for example, as 16974400 + 34245904 = 4120^2 + 5852^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220307) 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, 20759 + ... + 23094.

Almost surely, 2^51220304 is an apocalyptic number.

It is an amenable number.

51220304 is a deficient number, since it is larger than the sum of its proper divisors (49380772).

51220304 is a wasteful number, since it uses less digits than its factorization.

51220304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43934 (or 43928 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 51220304 is about 7156.8361724997. The cubic root of 51220304 is about 371.3761850040.

Adding to 51220304 its reverse (40302215), we get a palindrome (91522519).

The spelling of 51220304 in words is "fifty-one million, two hundred twenty thousand, three hundred four".