28213455 has 16 divisors (see below), whose sum is σ = 47797344. Its totient is φ = 14161920.

The previous prime is 28213403. The next prime is 28213459. The reversal of 28213455 is 55431282.

It is not a de Polignac number, because 28213455 - 2⁶ = 28213391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55066 + ... + 55575.

It is an arithmetic number, because the mean of its divisors is an integer number (2987334).

Almost surely, 2^28213455 is an apocalyptic number.

28213455 is a deficient number, since it is larger than the sum of its proper divisors (19583889).

28213455 is a wasteful number, since it uses less digits than its factorization.

28213455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110666.

The product of its digits is 9600, while the sum is 30.

The square root of 28213455 is about 5311.6339294044. The cubic root of 28213455 is about 304.4285816420.

The spelling of 28213455 in words is "twenty-eight million, two hundred thirteen thousand, four hundred fifty-five".