55228993 has 4 divisors (see below), whose sum is σ = 55409200. Its totient is φ = 55048788.

The previous prime is 55228981. The next prime is 55228997. The reversal of 55228993 is 39982255.

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 not a de Polignac number, because 55228993 - 2⁵ = 55228961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55228997) 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, 89643 + ... + 90256.

It is an arithmetic number, because the mean of its divisors is an integer number (13852300).

Almost surely, 2^55228993 is an apocalyptic number.

It is an amenable number.

55228993 is a deficient number, since it is larger than the sum of its proper divisors (180207).

55228993 is a wasteful number, since it uses less digits than its factorization.

55228993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180206.

The product of its digits is 194400, while the sum is 43.

The square root of 55228993 is about 7431.6211555757. The cubic root of 55228993 is about 380.8223028544.

The spelling of 55228993 in words is "fifty-five million, two hundred twenty-eight thousand, nine hundred ninety-three".