51215428880 has 320 divisors, whose sum is σ = 151790284800. Its totient is φ = 15609231360.

The previous prime is 51215428843. The next prime is 51215428883. The reversal of 51215428880 is 8882451215.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (51215428883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55729061 + ... + 55729979.

It is an arithmetic number, because the mean of its divisors is an integer number (474344640).

Almost surely, 2^51215428880 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 51215428880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75895142400).

51215428880 is an abundant number, since it is smaller than the sum of its proper divisors (100574855920).

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

51215428880 is a wasteful number, since it uses less digits than its factorization.

51215428880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 44.

The spelling of 51215428880 in words is "fifty-one billion, two hundred fifteen million, four hundred twenty-eight thousand, eight hundred eighty".