51223380 has 96 divisors (see below), whose sum is σ = 163586304. Its totient is φ = 11864064.

The previous prime is 51223379. The next prime is 51223423. The reversal of 51223380 is 8332215.

51223380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51223380.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11329 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (1704024).

Almost surely, 2^51223380 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 51223380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81793152).

51223380 is an abundant number, since it is smaller than the sum of its proper divisors (112362924).

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

51223380 is a wasteful number, since it uses less digits than its factorization.

51223380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905 (or 3903 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51223380 is about 7157.0510687014. The cubic root of 51223380 is about 371.3836191020.

Adding to 51223380 its reverse (8332215), we get a palindrome (59555595).

The spelling of 51223380 in words is "fifty-one million, two hundred twenty-three thousand, three hundred eighty".