55421805 has 8 divisors (see below), whose sum is σ = 88674912. Its totient is φ = 29558288.

The previous prime is 55421783. The next prime is 55421833. The reversal of 55421805 is 50812455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55421805 - 2⁹ = 55421293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1847379 + ... + 1847408.

It is an arithmetic number, because the mean of its divisors is an integer number (11084364).

Almost surely, 2^55421805 is an apocalyptic number.

It is an amenable number.

55421805 is a deficient number, since it is larger than the sum of its proper divisors (33253107).

55421805 is a wasteful number, since it uses less digits than its factorization.

55421805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694795.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 55421805 is about 7444.5822582600. The cubic root of 55421805 is about 381.2649557870.

The spelling of 55421805 in words is "fifty-five million, four hundred twenty-one thousand, eight hundred five".