51209333280 has 288 divisors, whose sum is σ = 199893657600. Its totient is φ = 11694606336.

The previous prime is 51209333239. The next prime is 51209333293. The reversal of 51209333280 is 8233390215.

51209333280 is a `hidden beast` number, since 512 + 0 + 9 + 33 + 32 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22567986 + ... + 22570254.

It is an arithmetic number, because the mean of its divisors is an integer number (694075200).

Almost surely, 2^51209333280 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 51209333280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99946828800).

51209333280 is an abundant number, since it is smaller than the sum of its proper divisors (148684324320).

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

51209333280 is a wasteful number, since it uses less digits than its factorization.

51209333280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536 (or 4525 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 51209333280 in words is "fifty-one billion, two hundred nine million, three hundred thirty-three thousand, two hundred eighty".