55287987 has 8 divisors (see below), whose sum is σ = 73761936. Its totient is φ = 36836352.

The previous prime is 55287979. The next prime is 55287989. The reversal of 55287987 is 78978255.

55287987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55287987 - 2³ = 55287979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55287989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1483 + ... + 10619.

It is an arithmetic number, because the mean of its divisors is an integer number (9220242).

Almost surely, 2^55287987 is an apocalyptic number.

55287987 is a deficient number, since it is larger than the sum of its proper divisors (18473949).

55287987 is a wasteful number, since it uses less digits than its factorization.

55287987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11157.

The product of its digits is 1411200, while the sum is 51.

The square root of 55287987 is about 7435.5892167333. The cubic root of 55287987 is about 380.9578490304.

The spelling of 55287987 in words is "fifty-five million, two hundred eighty-seven thousand, nine hundred eighty-seven".