55687555 has 32 divisors (see below), whose sum is σ = 84142080. Its totient is φ = 34369920.

The previous prime is 55687549. The next prime is 55687559. The reversal of 55687555 is 55578655.

55687555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55687555 - 2³ = 55687547 is a prime.

It is a super-2 number, since 2×55687555² = 6202207563756050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55687559) 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 31 ways as a sum of consecutive naturals, for example, 41302 + ... + 42628.

It is an arithmetic number, because the mean of its divisors is an integer number (2629440).

Almost surely, 2^55687555 is an apocalyptic number.

55687555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55687555 is a deficient number, since it is larger than the sum of its proper divisors (28454525).

55687555 is a wasteful number, since it uses less digits than its factorization.

55687555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459.

The product of its digits is 1050000, while the sum is 46.

The square root of 55687555 is about 7462.4094634374. The cubic root of 55687555 is about 381.8733784440.

Subtracting from 55687555 its reverse (55578655), we obtain a square (108900 = 330²).

The spelling of 55687555 in words is "fifty-five million, six hundred eighty-seven thousand, five hundred fifty-five".