55724638 has 8 divisors (see below), whose sum is σ = 84119832. Its totient is φ = 27684696.

The previous prime is 55724633. The next prime is 55724693. The reversal of 55724638 is 83642755.

55724638 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 a self number, because there is not a number n which added to its sum of digits gives 55724638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55724633) 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 3 ways as a sum of consecutive naturals, for example, 88420 + ... + 89047.

It is an arithmetic number, because the mean of its divisors is an integer number (10514979).

Almost surely, 2^55724638 is an apocalyptic number.

55724638 is a deficient number, since it is larger than the sum of its proper divisors (28395194).

55724638 is a wasteful number, since it uses less digits than its factorization.

55724638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177626.

The product of its digits is 201600, while the sum is 40.

The square root of 55724638 is about 7464.8937031950. The cubic root of 55724638 is about 381.9581242987.

The spelling of 55724638 in words is "fifty-five million, seven hundred twenty-four thousand, six hundred thirty-eight".