55428277 has 4 divisors (see below), whose sum is σ = 55447200. Its totient is φ = 55409356.

The previous prime is 55428259. The next prime is 55428281. The reversal of 55428277 is 77282455.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55428277 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55426277) 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, 4027 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (13861800).

Almost surely, 2^55428277 is an apocalyptic number.

It is an amenable number.

55428277 is a deficient number, since it is larger than the sum of its proper divisors (18923).

55428277 is a wasteful number, since it uses less digits than its factorization.

55428277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18922.

The product of its digits is 156800, while the sum is 40.

The square root of 55428277 is about 7445.0169240909. The cubic root of 55428277 is about 381.2797962200.

The spelling of 55428277 in words is "fifty-five million, four hundred twenty-eight thousand, two hundred seventy-seven".