51427400440 has 128 divisors (see below), whose sum is σ = 129090931200. Its totient is φ = 18316615680.

The previous prime is 51427400411. The next prime is 51427400501. The reversal of 51427400440 is 4400472415.

It is a super-2 number, since 2×51427400440² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1883929 + ... + 1911031.

It is an arithmetic number, because the mean of its divisors is an integer number (1008522900).

Almost surely, 2^51427400440 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 51427400440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64545465600).

51427400440 is an abundant number, since it is smaller than the sum of its proper divisors (77663530760).

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

51427400440 is a wasteful number, since it uses less digits than its factorization.

51427400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27257 (or 27253 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 31.

Adding to 51427400440 its reverse (4400472415), we get a palindrome (55827872855).

The spelling of 51427400440 in words is "fifty-one billion, four hundred twenty-seven million, four hundred thousand, four hundred forty".