51228799644 has 144 divisors (see below), whose sum is σ = 135199507968. Its totient is φ = 14972256000.

The previous prime is 51228799621. The next prime is 51228799649. The reversal of 51228799644 is 44699782215.

It is a super-3 number, since 3×51228799644³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51228799649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54672744 + ... + 54673680.

It is an arithmetic number, because the mean of its divisors is an integer number (938885472).

Almost surely, 2^51228799644 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 51228799644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67599753984).

51228799644 is an abundant number, since it is smaller than the sum of its proper divisors (83970708324).

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

51228799644 is a wasteful number, since it uses less digits than its factorization.

51228799644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 1415 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 57.

The spelling of 51228799644 in words is "fifty-one billion, two hundred twenty-eight million, seven hundred ninety-nine thousand, six hundred forty-four".