51330330 has 48 divisors (see below), whose sum is σ = 134316000. Its totient is φ = 13600224.

The previous prime is 51330317. The next prime is 51330379. The reversal of 51330330 is 3303315.

51330330 is a `hidden beast` number, since 5 + 1 + 330 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12921 + ... + 16419.

It is an arithmetic number, because the mean of its divisors is an integer number (2798250).

Almost surely, 2^51330330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51330330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67158000).

51330330 is an abundant number, since it is smaller than the sum of its proper divisors (82985670).

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

51330330 is a wasteful number, since it uses less digits than its factorization.

51330330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675 (or 3672 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 18.

The square root of 51330330 is about 7164.5188254341. The cubic root of 51330330 is about 371.6419117440.

Adding to 51330330 its reverse (3303315), we get a palindrome (54633645).

The spelling of 51330330 in words is "fifty-one million, three hundred thirty thousand, three hundred thirty".