55387785 has 16 divisors (see below), whose sum is σ = 93833856. Its totient is φ = 27802368.

The previous prime is 55387777. The next prime is 55387799. The reversal of 55387785 is 58778355.

It is a happy number.

It is not a de Polignac number, because 55387785 - 2³ = 55387777 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108349 + ... + 108858.

It is an arithmetic number, because the mean of its divisors is an integer number (5864616).

Almost surely, 2^55387785 is an apocalyptic number.

It is an amenable number.

55387785 is a deficient number, since it is larger than the sum of its proper divisors (38446071).

55387785 is a wasteful number, since it uses less digits than its factorization.

55387785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217232.

The product of its digits is 1176000, while the sum is 48.

The square root of 55387785 is about 7442.2970244408. The cubic root of 55387785 is about 381.1869282029.

The spelling of 55387785 in words is "fifty-five million, three hundred eighty-seven thousand, seven hundred eighty-five".