55678987 has 16 divisors (see below), whose sum is σ = 72136960. Its totient is φ = 41733792.

The previous prime is 55678979. The next prime is 55678993. The reversal of 55678987 is 78987655.

It is a cyclic number.

It is not a de Polignac number, because 55678987 - 2³ = 55678979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55678907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14373 + ... + 17830.

It is an arithmetic number, because the mean of its divisors is an integer number (4508560).

Almost surely, 2^55678987 is an apocalyptic number.

55678987 is a deficient number, since it is larger than the sum of its proper divisors (16457973).

55678987 is a wasteful number, since it uses less digits than its factorization.

55678987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32242.

The product of its digits is 4233600, while the sum is 55.

The square root of 55678987 is about 7461.8353640375. The cubic root of 55678987 is about 381.8537926262.

It can be divided in two parts, 55678 and 987, that added together give a palindrome (56665).

The spelling of 55678987 in words is "fifty-five million, six hundred seventy-eight thousand, nine hundred eighty-seven".