55639044 has 18 divisors (see below), whose sum is σ = 140643230. Its totient is φ = 18546336.

The previous prime is 55639043. The next prime is 55639057. The reversal of 55639044 is 44093655.

It is a happy number.

55639044 is a `hidden beast` number, since 5 + 563 + 90 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54199044 + 1440000 = 7362^2 + 1200^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1545529 = 55639044 / (5 + 5 + 6 + 3 + 9 + 0 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (55639043) 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 5 ways as a sum of consecutive naturals, for example, 772729 + ... + 772800.

Almost surely, 2^55639044 is an apocalyptic number.

It is an amenable number.

55639044 is an abundant number, since it is smaller than the sum of its proper divisors (85004186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55639044 is a wasteful number, since it uses less digits than its factorization.

55639044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545539 (or 1545534 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 55639044 is about 7459.1583975674. The cubic root of 55639044 is about 381.7624593389.

The spelling of 55639044 in words is "fifty-five million, six hundred thirty-nine thousand, forty-four".