28412221 has 8 divisors (see below), whose sum is σ = 29542464. Its totient is φ = 27302880.

The previous prime is 28412183. The next prime is 28412249. The reversal of 28412221 is 12221482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28412221 - 2¹⁵ = 28379453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28412192 and 28412201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28412261) 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 7 ways as a sum of consecutive naturals, for example, 2425 + ... + 7918.

It is an arithmetic number, because the mean of its divisors is an integer number (3692808).

Almost surely, 2^28412221 is an apocalyptic number.

It is an amenable number.

28412221 is a deficient number, since it is larger than the sum of its proper divisors (1130243).

28412221 is a wasteful number, since it uses less digits than its factorization.

28412221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10451.

The product of its digits is 512, while the sum is 22.

The square root of 28412221 is about 5330.3115293574. The cubic root of 28412221 is about 305.1418170549.

The spelling of 28412221 in words is "twenty-eight million, four hundred twelve thousand, two hundred twenty-one".