51030730 has 16 divisors (see below), whose sum is σ = 92804040. Its totient is φ = 20201472.

The previous prime is 51030671. The next prime is 51030737. The reversal of 51030730 is 3703015.

It can be written as a sum of positive squares in 4 ways, for example, as 48902049 + 2128681 = 6993^2 + 1459^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51030698 and 51030707.

It is not an unprimeable number, because it can be changed into a prime (51030737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25335 + ... + 27274.

Almost surely, 2^51030730 is an apocalyptic number.

51030730 is a deficient number, since it is larger than the sum of its proper divisors (41773310).

51030730 is a wasteful number, since it uses less digits than its factorization.

51030730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52713.

The product of its (nonzero) digits is 315, while the sum is 19.

The square root of 51030730 is about 7143.5796348889. The cubic root of 51030730 is about 370.9174456623.

Adding to 51030730 its reverse (3703015), we get a palindrome (54733745).

The spelling of 51030730 in words is "fifty-one million, thirty thousand, seven hundred thirty".