28264417 has 4 divisors (see below), whose sum is σ = 28420756. Its totient is φ = 28108080.

The previous prime is 28264409. The next prime is 28264433. The reversal of 28264417 is 71446282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71446282 = 2 ⋅35723141.

It can be written as a sum of positive squares in 2 ways, for example, as 5377761 + 22886656 = 2319^2 + 4784^2 .

It is a cyclic number.

It is not a de Polignac number, because 28264417 - 2³ = 28264409 is a prime.

It is a super-3 number, since 3×28264417³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28264477) 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, 77898 + ... + 78259.

It is an arithmetic number, because the mean of its divisors is an integer number (7105189).

Almost surely, 2^28264417 is an apocalyptic number.

It is an amenable number.

28264417 is a deficient number, since it is larger than the sum of its proper divisors (156339).

28264417 is a wasteful number, since it uses less digits than its factorization.

28264417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156338.

The product of its digits is 21504, while the sum is 34.

The square root of 28264417 is about 5316.4289706531. The cubic root of 28264417 is about 304.6117679690.

The spelling of 28264417 in words is "twenty-eight million, two hundred sixty-four thousand, four hundred seventeen".