55427857 has 4 divisors (see below), whose sum is σ = 55453876. Its totient is φ = 55401840.

The previous prime is 55427821. The next prime is 55427909. The reversal of 55427857 is 75872455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29203216 + 26224641 = 5404^2 + 5121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55427857 is a prime.

It is a super-2 number, since 2×55427857² = 6144494663224898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55427257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9498 + ... + 14179.

It is an arithmetic number, because the mean of its divisors is an integer number (13863469).

Almost surely, 2^55427857 is an apocalyptic number.

It is an amenable number.

55427857 is a deficient number, since it is larger than the sum of its proper divisors (26019).

55427857 is a wasteful number, since it uses less digits than its factorization.

55427857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26018.

The product of its digits is 392000, while the sum is 43.

The square root of 55427857 is about 7444.9887172514. The cubic root of 55427857 is about 381.2788331862.

The spelling of 55427857 in words is "fifty-five million, four hundred twenty-seven thousand, eight hundred fifty-seven".