51233320 has 16 divisors (see below), whose sum is σ = 115275060. Its totient is φ = 20493312.

The previous prime is 51233311. The next prime is 51233321. The reversal of 51233320 is 2333215.

It can be written as a sum of positive squares in 2 ways, for example, as 48692484 + 2540836 = 6978^2 + 1594^2 .

It is not an unprimeable number, because it can be changed into a prime (51233321) 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, 640377 + ... + 640456.

Almost surely, 2^51233320 is an apocalyptic number.

It is an amenable number.

51233320 is an abundant number, since it is smaller than the sum of its proper divisors (64041740).

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

51233320 is a wasteful number, since it uses less digits than its factorization.

51233320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280844 (or 1280840 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 51233320 is about 7157.7454550997. The cubic root of 51233320 is about 371.4076401279.

Adding to 51233320 its reverse (2333215), we get a palindrome (53566535).

The spelling of 51233320 in words is "fifty-one million, two hundred thirty-three thousand, three hundred twenty".