55287273 has 4 divisors (see below), whose sum is σ = 73716368. Its totient is φ = 36858180.

The previous prime is 55287259. The next prime is 55287313. The reversal of 55287273 is 37278255.

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 not a de Polignac number, because 55287273 - 2¹⁰ = 55286249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55287173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9214543 + ... + 9214548.

It is an arithmetic number, because the mean of its divisors is an integer number (18429092).

Almost surely, 2^55287273 is an apocalyptic number.

It is an amenable number.

55287273 is a deficient number, since it is larger than the sum of its proper divisors (18429095).

55287273 is a wasteful number, since it uses less digits than its factorization.

55287273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18429094.

The product of its digits is 117600, while the sum is 39.

The square root of 55287273 is about 7435.5412042433. The cubic root of 55287273 is about 380.9562091017.

The spelling of 55287273 in words is "fifty-five million, two hundred eighty-seven thousand, two hundred seventy-three".