55288321 has 4 divisors (see below), whose sum is σ = 60314544. Its totient is φ = 50262100.

The previous prime is 55288253. The next prime is 55288327. The reversal of 55288321 is 12388255.

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 not a de Polignac number, because 55288321 - 2⁷ = 55288193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55288327) 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, 2513095 + ... + 2513116.

It is an arithmetic number, because the mean of its divisors is an integer number (15078636).

Almost surely, 2^55288321 is an apocalyptic number.

It is an amenable number.

55288321 is a deficient number, since it is larger than the sum of its proper divisors (5026223).

55288321 is a wasteful number, since it uses less digits than its factorization.

55288321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026222.

The product of its digits is 19200, while the sum is 34.

The square root of 55288321 is about 7435.6116762510. The cubic root of 55288321 is about 380.9586161631.

The spelling of 55288321 in words is "fifty-five million, two hundred eighty-eight thousand, three hundred twenty-one".