55405644 has 24 divisors (see below), whose sum is σ = 147748608. Its totient is φ = 15830160.

The previous prime is 55405639. The next prime is 55405663. The reversal of 55405644 is 44650455.

55405644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329712 + ... + 329879.

It is an arithmetic number, because the mean of its divisors is an integer number (6156192).

Almost surely, 2^55405644 is an apocalyptic number.

It is an amenable number.

55405644 is an abundant number, since it is smaller than the sum of its proper divisors (92342964).

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

55405644 is a wasteful number, since it uses less digits than its factorization.

55405644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659605 (or 659603 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The square root of 55405644 is about 7443.4967589165. The cubic root of 55405644 is about 381.2278932268.

The spelling of 55405644 in words is "fifty-five million, four hundred five thousand, six hundred forty-four".