51004420 has 48 divisors (see below), whose sum is σ = 115153920. Its totient is φ = 18906624.

The previous prime is 51004381. The next prime is 51004423. The reversal of 51004420 is 2440015.

It is a junction number, because it is equal to n+sod(n) for n = 51004394 and 51004403.

It is not an unprimeable number, because it can be changed into a prime (51004423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21661 + ... + 23899.

It is an arithmetic number, because the mean of its divisors is an integer number (2399040).

Almost surely, 2^51004420 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 51004420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57576960).

51004420 is an abundant number, since it is smaller than the sum of its proper divisors (64149500).

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

51004420 is a wasteful number, since it uses less digits than its factorization.

51004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2330 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 51004420 is about 7141.7378837367. The cubic root of 51004420 is about 370.8536898587.

Adding to 51004420 its reverse (2440015), we get a palindrome (53444435).

The spelling of 51004420 in words is "fifty-one million, four thousand, four hundred twenty".