55399017728 has 72 divisors (see below), whose sum is σ = 114811447296. Its totient is φ = 26650368000.

The previous prime is 55399017727. The next prime is 55399017743. The reversal of 55399017728 is 82771099355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55399017727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1352753 + ... + 1393103.

Almost surely, 2^55399017728 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 55399017728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57405723648).

55399017728 is an abundant number, since it is smaller than the sum of its proper divisors (59412429568).

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

55399017728 is a wasteful number, since it uses less digits than its factorization.

55399017728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40571 (or 40557 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 55399017728 in words is "fifty-five billion, three hundred ninety-nine million, seventeen thousand, seven hundred twenty-eight".