55144642 has 8 divisors (see below), whose sum is σ = 94533696. Its totient is φ = 23633412.

The previous prime is 55144637. The next prime is 55144643. The reversal of 55144642 is 24644155.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (55144643) 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 3 ways as a sum of consecutive naturals, for example, 1969438 + ... + 1969465.

It is an arithmetic number, because the mean of its divisors is an integer number (11816712).

Almost surely, 2^55144642 is an apocalyptic number.

55144642 is a deficient number, since it is larger than the sum of its proper divisors (39389054).

55144642 is a wasteful number, since it uses less digits than its factorization.

55144642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938912.

The product of its digits is 19200, while the sum is 31.

The square root of 55144642 is about 7425.9438457344. The cubic root of 55144642 is about 380.6283279881.

Adding to 55144642 its reverse (24644155), we get a palindrome (79788797).

The spelling of 55144642 in words is "fifty-five million, one hundred forty-four thousand, six hundred forty-two".