55320789888 has 576 divisors, whose sum is σ = 205770250800. Its totient is φ = 14582550528.

The previous prime is 55320789857. The next prime is 55320789889. The reversal of 55320789888 is 88898702355.

55320789888 is a `hidden beast` number, since 5 + 532 + 0 + 7 + 8 + 98 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320789889) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28618170 + ... + 28620102.

Almost surely, 2^55320789888 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 55320789888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102885125400).

55320789888 is an abundant number, since it is smaller than the sum of its proper divisors (150449460912).

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

55320789888 is a wasteful number, since it uses less digits than its factorization.

55320789888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 1958 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 63.

The spelling of 55320789888 in words is "fifty-five billion, three hundred twenty million, seven hundred eighty-nine thousand, eight hundred eighty-eight".