28264427 has 4 divisors (see below), whose sum is σ = 28289736. Its totient is φ = 28239120.

The previous prime is 28264409. The next prime is 28264433. The reversal of 28264427 is 72446282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28264427 - 2¹⁴ = 28248043 is a prime.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10898 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (7072434).

Almost surely, 2^28264427 is an apocalyptic number.

28264427 is a deficient number, since it is larger than the sum of its proper divisors (25309).

28264427 is a wasteful number, since it uses less digits than its factorization.

28264427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25308.

The product of its digits is 43008, while the sum is 35.

The square root of 28264427 is about 5316.4299111340. The cubic root of 28264427 is about 304.6118038931.

The spelling of 28264427 in words is "twenty-eight million, two hundred sixty-four thousand, four hundred twenty-seven".