55617850728 has 96 divisors (see below), whose sum is σ = 164474425440. Its totient is φ = 16838616960.

The previous prime is 55617850723. The next prime is 55617850747. The reversal of 55617850728 is 82705871655.

55617850728 is a `hidden beast` number, since 5 + 5 + 61 + 78 + 507 + 2 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (55617850723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 858150 + ... + 920682.

It is an arithmetic number, because the mean of its divisors is an integer number (1713275265).

Almost surely, 2^55617850728 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 55617850728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82237212720).

55617850728 is an abundant number, since it is smaller than the sum of its proper divisors (108856574712).

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

55617850728 is a wasteful number, since it uses less digits than its factorization.

55617850728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63679 (or 63672 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 54.

The spelling of 55617850728 in words is "fifty-five billion, six hundred seventeen million, eight hundred fifty thousand, seven hundred twenty-eight".