51254300440 has 128 divisors (see below), whose sum is σ = 139962816000. Its totient is φ = 16500492288.

The previous prime is 51254300423. The next prime is 51254300483. The reversal of 51254300440 is 4400345215.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 51254300399 and 51254300408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558531 + ... + 643789.

It is an arithmetic number, because the mean of its divisors is an integer number (1093459500).

Almost surely, 2^51254300440 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 51254300440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69981408000).

51254300440 is an abundant number, since it is smaller than the sum of its proper divisors (88708515560).

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

51254300440 is a wasteful number, since it uses less digits than its factorization.

51254300440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85409 (or 85405 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 51254300440 its reverse (4400345215), we get a palindrome (55654645655).

The spelling of 51254300440 in words is "fifty-one billion, two hundred fifty-four million, three hundred thousand, four hundred forty".