55388885 has 4 divisors (see below), whose sum is σ = 66466668. Its totient is φ = 44311104.

The previous prime is 55388863. The next prime is 55388911. The reversal of 55388885 is 58888355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15673681 + 39715204 = 3959^2 + 6302^2 .

It is a cyclic number.

It is not a de Polignac number, because 55388885 - 2¹⁰ = 55387861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5538884 + ... + 5538893.

It is an arithmetic number, because the mean of its divisors is an integer number (16616667).

Almost surely, 2^55388885 is an apocalyptic number.

It is an amenable number.

55388885 is a deficient number, since it is larger than the sum of its proper divisors (11077783).

55388885 is a wasteful number, since it uses less digits than its factorization.

55388885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11077782.

The product of its digits is 1536000, while the sum is 50.

The square root of 55388885 is about 7442.3709259886. The cubic root of 55388885 is about 381.1894516404.

The spelling of 55388885 in words is "fifty-five million, three hundred eighty-eight thousand, eight hundred eighty-five".