55730861 has 6 divisors (see below), whose sum is σ = 56944110. Its totient is φ = 54542936.

The previous prime is 55730791. The next prime is 55730903. The reversal of 55730861 is 16803755.

55730861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 34515625 + 21215236 = 5875^2 + 4606^2 .

It is not a de Polignac number, because 55730861 - 2¹⁰ = 55729837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55730261) 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 5 ways as a sum of consecutive naturals, for example, 10406 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (9490685).

Almost surely, 2^55730861 is an apocalyptic number.

It is an amenable number.

55730861 is a deficient number, since it is larger than the sum of its proper divisors (1213249).

55730861 is an equidigital number, since it uses as much as digits as its factorization.

55730861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25323 (or 25276 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 55730861 is about 7465.3105092822. The cubic root of 55730861 is about 381.9723420488.

The spelling of 55730861 in words is "fifty-five million, seven hundred thirty thousand, eight hundred sixty-one".