56556706428 has 144 divisors (see below), whose sum is σ = 158118682176. Its totient is φ = 16954122240.

The previous prime is 56556706397. The next prime is 56556706433. The reversal of 56556706428 is 82460765565.

56556706428 is a `hidden beast` number, since 5 + 6 + 556 + 7 + 0 + 64 + 28 = 666.

It is a super-2 number, since 2×56556706428² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 20845200 + ... + 20847912.

It is an arithmetic number, because the mean of its divisors is an integer number (1098046404).

Almost surely, 2^56556706428 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 56556706428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79059341088).

56556706428 is an abundant number, since it is smaller than the sum of its proper divisors (101561975748).

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

56556706428 is a wasteful number, since it uses less digits than its factorization.

56556706428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244 (or 4239 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 54.

The spelling of 56556706428 in words is "fifty-six billion, five hundred fifty-six million, seven hundred six thousand, four hundred twenty-eight".