51333220 has 12 divisors (see below), whose sum is σ = 107799804. Its totient is φ = 20533280.

The previous prime is 51333199. The next prime is 51333239. The reversal of 51333220 is 2233315.

It can be written as a sum of positive squares in 2 ways, for example, as 31832164 + 19501056 = 5642^2 + 4416^2 .

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 3 ways as a sum of consecutive naturals, for example, 1283311 + ... + 1283350.

It is an arithmetic number, because the mean of its divisors is an integer number (8983317).

Almost surely, 2^51333220 is an apocalyptic number.

It is an amenable number.

51333220 is an abundant number, since it is smaller than the sum of its proper divisors (56466584).

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

51333220 is a wasteful number, since it uses less digits than its factorization.

51333220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566670 (or 2566668 counting only the distinct ones).

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

The square root of 51333220 is about 7164.7205109481. The cubic root of 51333220 is about 371.6488863402.

Adding to 51333220 its reverse (2233315), we get a palindrome (53566535).

It can be divided in two parts, 513 and 33220, that added together give a palindrome (33733).

The spelling of 51333220 in words is "fifty-one million, three hundred thirty-three thousand, two hundred twenty".