51120330 has 64 divisors (see below), whose sum is σ = 128960640. Its totient is φ = 12950784.

The previous prime is 51120323. The next prime is 51120331. The reversal of 51120330 is 3302115.

It is a happy number.

It is a super-2 number, since 2×51120330² = 5226576278617800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (51120331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57852 + ... + 58728.

It is an arithmetic number, because the mean of its divisors is an integer number (2015010).

Almost surely, 2^51120330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51120330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64480320).

51120330 is an abundant number, since it is smaller than the sum of its proper divisors (77840310).

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

51120330 is a wasteful number, since it uses less digits than its factorization.

51120330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 51120330 is about 7149.8482501379. The cubic root of 51120330 is about 371.1344049413.

Adding to 51120330 its reverse (3302115), we get a palindrome (54422445).

The spelling of 51120330 in words is "fifty-one million, one hundred twenty thousand, three hundred thirty".