51504272820 has 672 divisors, whose sum is σ = 217792753920. Its totient is φ = 9876142080.

The previous prime is 51504272791. The next prime is 51504272891. The reversal of 51504272820 is 2827240515.

It is a happy number.

51504272820 is a `hidden beast` number, since 5 + 1 + 504 + 2 + 72 + 82 + 0 = 666.

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

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 223 ways as a sum of consecutive naturals, for example, 14592816 + ... + 14596344.

It is an arithmetic number, because the mean of its divisors is an integer number (324096360).

Almost surely, 2^51504272820 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 51504272820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108896376960).

51504272820 is an abundant number, since it is smaller than the sum of its proper divisors (166288481100).

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

51504272820 is a wasteful number, since it uses less digits than its factorization.

51504272820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587 (or 3570 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 51504272820 in words is "fifty-one billion, five hundred four million, two hundred seventy-two thousand, eight hundred twenty".