28047671 has 4 divisors (see below), whose sum is σ = 29697552. Its totient is φ = 26397792.

The previous prime is 28047661. The next prime is 28047697. The reversal of 28047671 is 17674082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28047671 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 (28047601) 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, 824915 + ... + 824948.

It is an arithmetic number, because the mean of its divisors is an integer number (7424388).

Almost surely, 2^28047671 is an apocalyptic number.

28047671 is a deficient number, since it is larger than the sum of its proper divisors (1649881).

28047671 is a wasteful number, since it uses less digits than its factorization.

28047671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649880.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28047671 is about 5296.0051925956. The cubic root of 28047671 is about 303.8311295198.

The spelling of 28047671 in words is "twenty-eight million, forty-seven thousand, six hundred seventy-one".