55705857 has 16 divisors (see below), whose sum is σ = 76108032. Its totient is φ = 36225920.

The previous prime is 55705847. The next prime is 55705861. The reversal of 55705857 is 75850755.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55705857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55705807) 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 15 ways as a sum of consecutive naturals, for example, 64573 + ... + 65429.

It is an arithmetic number, because the mean of its divisors is an integer number (4756752).

Almost surely, 2^55705857 is an apocalyptic number.

It is an amenable number.

55705857 is a deficient number, since it is larger than the sum of its proper divisors (20402175).

55705857 is a wasteful number, since it uses less digits than its factorization.

55705857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 245000, while the sum is 42.

The square root of 55705857 is about 7463.6356422323. The cubic root of 55705857 is about 381.9152087419.

The spelling of 55705857 in words is "fifty-five million, seven hundred five thousand, eight hundred fifty-seven".