55640193 has 32 divisors (see below), whose sum is σ = 88062720. Its totient is φ = 30585600.

The previous prime is 55640191. The next prime is 55640209. The reversal of 55640193 is 39104655.

It is a happy number.

It is not a de Polignac number, because 55640193 - 2¹ = 55640191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55640191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78123 + ... + 78831.

It is an arithmetic number, because the mean of its divisors is an integer number (2751960).

Almost surely, 2^55640193 is an apocalyptic number.

It is an amenable number.

55640193 is a deficient number, since it is larger than the sum of its proper divisors (32422527).

55640193 is a wasteful number, since it uses less digits than its factorization.

55640193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 55640193 is about 7459.2354165826. The cubic root of 55640193 is about 381.7650872420.

The spelling of 55640193 in words is "fifty-five million, six hundred forty thousand, one hundred ninety-three".