55639867 has 4 divisors (see below), whose sum is σ = 55683936. Its totient is φ = 55595800.

The previous prime is 55639849. The next prime is 55639873. The reversal of 55639867 is 76893655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55639867 - 2¹⁵ = 55607099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55639867.

It is not an unprimeable number, because it can be changed into a prime (55639817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20083 + ... + 22684.

It is an arithmetic number, because the mean of its divisors is an integer number (13920984).

Almost surely, 2^55639867 is an apocalyptic number.

55639867 is a deficient number, since it is larger than the sum of its proper divisors (44069).

55639867 is a wasteful number, since it uses less digits than its factorization.

55639867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44068.

The product of its digits is 1360800, while the sum is 49.

The square root of 55639867 is about 7459.2135644450. The cubic root of 55639867 is about 381.7643416439.

The spelling of 55639867 in words is "fifty-five million, six hundred thirty-nine thousand, eight hundred sixty-seven".