51335220 has 96 divisors (see below), whose sum is σ = 150433920. Its totient is φ = 13063680.

The previous prime is 51335203. The next prime is 51335237. The reversal of 51335220 is 2253315.

It is an interprime number because it is at equal distance from previous prime (51335203) and next prime (51335237).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 283530 + ... + 283710.

It is an arithmetic number, because the mean of its divisors is an integer number (1567020).

Almost surely, 2^51335220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51335220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75216960).

51335220 is an abundant number, since it is smaller than the sum of its proper divisors (99098700).

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

51335220 is a wasteful number, since it uses less digits than its factorization.

51335220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 383 counting only the distinct ones).

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

The square root of 51335220 is about 7164.8600823743. The cubic root of 51335220 is about 371.6537128971.

Adding to 51335220 its reverse (2253315), we get a palindrome (53588535).

The spelling of 51335220 in words is "fifty-one million, three hundred thirty-five thousand, two hundred twenty".