55428647 has 4 divisors (see below), whose sum is σ = 55919280. Its totient is φ = 54938016.

The previous prime is 55428623. The next prime is 55428767. The reversal of 55428647 is 74682455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74682455 = 5 ⋅14936491.

It is a cyclic number.

It is not a de Polignac number, because 55428647 - 2²² = 51234343 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 (55428617) 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, 245147 + ... + 245372.

It is an arithmetic number, because the mean of its divisors is an integer number (13979820).

Almost surely, 2^55428647 is an apocalyptic number.

55428647 is a deficient number, since it is larger than the sum of its proper divisors (490633).

55428647 is a wasteful number, since it uses less digits than its factorization.

55428647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490632.

The product of its digits is 268800, while the sum is 41.

The square root of 55428647 is about 7445.0417728848. The cubic root of 55428647 is about 381.2806446029.

The spelling of 55428647 in words is "fifty-five million, four hundred twenty-eight thousand, six hundred forty-seven".