55573857 has 16 divisors (see below), whose sum is σ = 83351360. Its totient is φ = 37047780.

The previous prime is 55573853. The next prime is 55573891. The reversal of 55573857 is 75837555.

It is not a de Polignac number, because 55573857 - 2² = 55573853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55573853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10519 + ... + 14892.

It is an arithmetic number, because the mean of its divisors is an integer number (5209460).

Almost surely, 2^55573857 is an apocalyptic number.

It is an amenable number.

55573857 is a deficient number, since it is larger than the sum of its proper divisors (27777503).

55573857 is an frugal number, since it uses more digits than its factorization.

55573857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25432 (or 25414 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The square root of 55573857 is about 7454.7875221229. The cubic root of 55573857 is about 381.6133094325.

The spelling of 55573857 in words is "fifty-five million, five hundred seventy-three thousand, eight hundred fifty-seven".