55997289 has 24 divisors (see below), whose sum is σ = 84527040. Its totient is φ = 35677152.

The previous prime is 55997251. The next prime is 55997297. The reversal of 55997289 is 98279955.

55997289 is a `hidden beast` number, since 559 + 9 + 7 + 2 + 89 = 666.

It is not a de Polignac number, because 55997289 - 2¹⁵ = 55964521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55997219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25842 + ... + 27924.

It is an arithmetic number, because the mean of its divisors is an integer number (3521960).

Almost surely, 2^55997289 is an apocalyptic number.

It is an amenable number.

55997289 is a deficient number, since it is larger than the sum of its proper divisors (28529751).

55997289 is a wasteful number, since it uses less digits than its factorization.

55997289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2218 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 55997289 is about 7483.1336350489. The cubic root of 55997289 is about 382.5800626972.

The spelling of 55997289 in words is "fifty-five million, nine hundred ninety-seven thousand, two hundred eighty-nine".