55287489 has 8 divisors (see below), whose sum is σ = 73751392. Its totient is φ = 36840960.

The previous prime is 55287467. The next prime is 55287497. The reversal of 55287489 is 98478255.

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

It is not a de Polignac number, because 55287489 - 2⁵ = 55287457 is a prime.

It is a super-3 number, since 3×55287489³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55287409) 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, 8577 + ... + 13569.

It is an arithmetic number, because the mean of its divisors is an integer number (9218924).

Almost surely, 2^55287489 is an apocalyptic number.

It is an amenable number.

55287489 is a deficient number, since it is larger than the sum of its proper divisors (18463903).

55287489 is a wasteful number, since it uses less digits than its factorization.

55287489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8687.

The product of its digits is 806400, while the sum is 48.

The square root of 55287489 is about 7435.5557290629. Note that the first 3 decimals coincide. The cubic root of 55287489 is about 380.9567052160.

The spelling of 55287489 in words is "fifty-five million, two hundred eighty-seven thousand, four hundred eighty-nine".