51630224 has 20 divisors (see below), whose sum is σ = 105918444. Its totient is φ = 24296448.

The previous prime is 51630211. The next prime is 51630253. The reversal of 51630224 is 42203615.

It can be written as a sum of positive squares in 2 ways, for example, as 43033600 + 8596624 = 6560^2 + 2932^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51630224.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94637 + ... + 95180.

Almost surely, 2^51630224 is an apocalyptic number.

It is an amenable number.

51630224 is an abundant number, since it is smaller than the sum of its proper divisors (54288220).

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

51630224 is a wasteful number, since it uses less digits than its factorization.

51630224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189842 (or 189836 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 51630224 is about 7185.4174548178. The cubic root of 51630224 is about 372.3642710762.

Adding to 51630224 its reverse (42203615), we get a palindrome (93833839).

The spelling of 51630224 in words is "fifty-one million, six hundred thirty thousand, two hundred twenty-four".