51233520 has 80 divisors (see below), whose sum is σ = 171051552. Its totient is φ = 12610560.

The previous prime is 51233513. The next prime is 51233521. The reversal of 51233520 is 2533215.

51233520 = 270² + 271² + ... + 557².

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51233521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5091 + ... + 11330.

Almost surely, 2^51233520 is an apocalyptic number.

It is an amenable number.

51233520 is an abundant number, since it is smaller than the sum of its proper divisors (119818032).

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

51233520 is a wasteful number, since it uses less digits than its factorization.

51233520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16450 (or 16444 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 51233520 is about 7157.7594259656. The cubic root of 51233520 is about 371.4081234164.

Adding to 51233520 its reverse (2533215), we get a palindrome (53766735).

The spelling of 51233520 in words is "fifty-one million, two hundred thirty-three thousand, five hundred twenty".