51630280 has 32 divisors (see below), whose sum is σ = 125105400. Its totient is φ = 19063296.

The previous prime is 51630269. The next prime is 51630301. The reversal of 51630280 is 8203615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 47361924 + 4268356 = 6882^2 + 2066^2 .

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, 49125 + ... + 50164.

Almost surely, 2^51630280 is an apocalyptic number.

It is an amenable number.

51630280 is an abundant number, since it is smaller than the sum of its proper divisors (73475120).

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

51630280 is a wasteful number, since it uses less digits than its factorization.

51630280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99313 (or 99309 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51630280 is about 7185.4213515980. The cubic root of 51630280 is about 372.3644057027.

Adding to 51630280 its reverse (8203615), we get a palindrome (59833895).

The spelling of 51630280 in words is "fifty-one million, six hundred thirty thousand, two hundred eighty".