55138287 has 16 divisors (see below), whose sum is σ = 75491840. Its totient is φ = 35785152.

The previous prime is 55138271. The next prime is 55138289. The reversal of 55138287 is 78283155.

It is not a de Polignac number, because 55138287 - 2⁴ = 55138271 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 (55138289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15708 + ... + 18894.

It is an arithmetic number, because the mean of its divisors is an integer number (4718240).

Almost surely, 2^55138287 is an apocalyptic number.

55138287 is a deficient number, since it is larger than the sum of its proper divisors (20353553).

55138287 is a wasteful number, since it uses less digits than its factorization.

55138287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342.

The product of its digits is 67200, while the sum is 39.

The square root of 55138287 is about 7425.5159416703. The cubic root of 55138287 is about 380.6137059211.

The spelling of 55138287 in words is "fifty-five million, one hundred thirty-eight thousand, two hundred eighty-seven".