55909840 has 40 divisors (see below), whose sum is σ = 148561920. Its totient is φ = 19168896.

The previous prime is 55909829. The next prime is 55909871. The reversal of 55909840 is 4890955.

55909840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55909793 and 55909802.

It is a congruent number.

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, 49360 + ... + 50479.

It is an arithmetic number, because the mean of its divisors is an integer number (3714048).

Almost surely, 2^55909840 is an apocalyptic number.

It is an amenable number.

55909840 is an abundant number, since it is smaller than the sum of its proper divisors (92652080).

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

55909840 is a wasteful number, since it uses less digits than its factorization.

55909840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99859 (or 99853 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 55909840 is about 7477.2882785138. The cubic root of 55909840 is about 382.3808049864.

The spelling of 55909840 in words is "fifty-five million, nine hundred nine thousand, eight hundred forty".