28447261 has 4 divisors (see below), whose sum is σ = 28723552. Its totient is φ = 28170972.

The previous prime is 28447259. The next prime is 28447283. The reversal of 28447261 is 16274482.

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 28447261 - 2¹ = 28447259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137991 + ... + 138196.

It is an arithmetic number, because the mean of its divisors is an integer number (7180888).

Almost surely, 2^28447261 is an apocalyptic number.

It is an amenable number.

28447261 is a deficient number, since it is larger than the sum of its proper divisors (276291).

28447261 is a wasteful number, since it uses less digits than its factorization.

28447261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276290.

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

The square root of 28447261 is about 5333.5973788804. The cubic root of 28447261 is about 305.2672064877.

The spelling of 28447261 in words is "twenty-eight million, four hundred forty-seven thousand, two hundred sixty-one".