55216687 has 6 divisors (see below), whose sum is σ = 56532552. Its totient is φ = 53930772.

The previous prime is 55216649. The next prime is 55216741. The reversal of 55216687 is 78661255.

55216687 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 55216687 - 2⁷ = 55216559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55219687) 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 5 ways as a sum of consecutive naturals, for example, 13083 + ... + 16780.

It is an arithmetic number, because the mean of its divisors is an integer number (9422092).

Almost surely, 2^55216687 is an apocalyptic number.

55216687 is a deficient number, since it is larger than the sum of its proper divisors (1315865).

55216687 is an equidigital number, since it uses as much as digits as its factorization.

55216687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29949 (or 29906 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 55216687 is about 7430.7931608947. The cubic root of 55216687 is about 380.7940160970.

The spelling of 55216687 in words is "fifty-five million, two hundred sixteen thousand, six hundred eighty-seven".