51504450 has 48 divisors (see below), whose sum is σ = 128964960. Its totient is φ = 13601920.

The previous prime is 51504443. The next prime is 51504457. The reversal of 51504450 is 5440515.

It is an interprime number because it is at equal distance from previous prime (51504443) and next prime (51504457).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51504450.

It is not an unprimeable number, because it can be changed into a prime (51504457) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 14446 + ... + 17654.

It is an arithmetic number, because the mean of its divisors is an integer number (2686770).

Almost surely, 2^51504450 is an apocalyptic number.

51504450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51504450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64482480).

51504450 is an abundant number, since it is smaller than the sum of its proper divisors (77460510).

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

51504450 is a wasteful number, since it uses less digits than its factorization.

51504450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51504450 is about 7176.6600866977. The cubic root of 51504450 is about 372.0616587586.

Adding to 51504450 its reverse (5440515), we get a palindrome (56944965).

The spelling of 51504450 in words is "fifty-one million, five hundred four thousand, four hundred fifty".