55278269 has 4 divisors (see below), whose sum is σ = 57681696. Its totient is φ = 52874844.

The previous prime is 55278247. The next prime is 55278281. The reversal of 55278269 is 96287255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55278269 is a prime.

It is a super-2 number, since 2×55278269² = 6111374047272722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55208269) 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 3 ways as a sum of consecutive naturals, for example, 1201679 + ... + 1201724.

It is an arithmetic number, because the mean of its divisors is an integer number (14420424).

Almost surely, 2^55278269 is an apocalyptic number.

It is an amenable number.

55278269 is a deficient number, since it is larger than the sum of its proper divisors (2403427).

55278269 is a wasteful number, since it uses less digits than its factorization.

55278269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403426.

The product of its digits is 302400, while the sum is 44.

The square root of 55278269 is about 7434.9357092042. The cubic root of 55278269 is about 380.9355273320.

The spelling of 55278269 in words is "fifty-five million, two hundred seventy-eight thousand, two hundred sixty-nine".