55397287 has 8 divisors (see below), whose sum is σ = 61839360. Its totient is φ = 49189560.

The previous prime is 55397267. The next prime is 55397297. The reversal of 55397287 is 78279355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55397287 - 2¹¹ = 55395239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55397207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58087 + ... + 59032.

It is an arithmetic number, because the mean of its divisors is an integer number (7729920).

Almost surely, 2^55397287 is an apocalyptic number.

55397287 is a deficient number, since it is larger than the sum of its proper divisors (6442073).

55397287 is a wasteful number, since it uses less digits than its factorization.

55397287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117173.

The product of its digits is 529200, while the sum is 46.

The square root of 55397287 is about 7442.9353752401. The cubic root of 55397287 is about 381.2087250130.

The spelling of 55397287 in words is "fifty-five million, three hundred ninety-seven thousand, two hundred eighty-seven".