55668420 has 36 divisors (see below), whose sum is σ = 168861420. Its totient is φ = 14844864.

The previous prime is 55668419. The next prime is 55668427. The reversal of 55668420 is 2486655.

55668420 is a `hidden beast` number, since 556 + 6 + 84 + 20 = 666.

55668420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 37161216 = 4302^2 + 6096^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55668427) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 154455 + ... + 154814.

It is an arithmetic number, because the mean of its divisors is an integer number (4690595).

Almost surely, 2^55668420 is an apocalyptic number.

It is an amenable number.

55668420 is an abundant number, since it is smaller than the sum of its proper divisors (113193000).

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

55668420 is a wasteful number, since it uses less digits than its factorization.

55668420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309284 (or 309279 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 55668420 is about 7461.1272606758. The cubic root of 55668420 is about 381.8296344740.

The spelling of 55668420 in words is "fifty-five million, six hundred sixty-eight thousand, four hundred twenty".