55860257 has 4 divisors (see below), whose sum is σ = 56625540. Its totient is φ = 55094976.

The previous prime is 55860241. The next prime is 55860319. The reversal of 55860257 is 75206855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75206855 = 5 ⋅15041371.

It can be written as a sum of positive squares in 2 ways, for example, as 19088161 + 36772096 = 4369^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 55860257 - 2⁴ = 55860241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55860257.

It is not an unprimeable number, because it can be changed into a prime (55866257) 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, 382532 + ... + 382677.

It is an arithmetic number, because the mean of its divisors is an integer number (14156385).

Almost surely, 2^55860257 is an apocalyptic number.

It is an amenable number.

55860257 is a deficient number, since it is larger than the sum of its proper divisors (765283).

55860257 is an equidigital number, since it uses as much as digits as its factorization.

55860257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765282.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 55860257 is about 7473.9719694417. The cubic root of 55860257 is about 382.2677348786.

The spelling of 55860257 in words is "fifty-five million, eight hundred sixty thousand, two hundred fifty-seven".