55646388 has 72 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 15831360.

The previous prime is 55646377. The next prime is 55646399. The reversal of 55646388 is 88364655.

55646388 is a `hidden beast` number, since 5 + 5 + 6 + 4 + 638 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (55646377) and next prime (55646399).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115933 + ... + 116411.

It is an arithmetic number, because the mean of its divisors is an integer number (2242240).

Almost surely, 2^55646388 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 55646388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80720640).

55646388 is an abundant number, since it is smaller than the sum of its proper divisors (105794892).

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

55646388 is a wasteful number, since it uses less digits than its factorization.

55646388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 952 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 55646388 is about 7459.6506620619. The cubic root of 55646388 is about 381.7792553389.

The spelling of 55646388 in words is "fifty-five million, six hundred forty-six thousand, three hundred eighty-eight".