28684071 has 32 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 17388000.

The previous prime is 28684067. The next prime is 28684079. The reversal of 28684071 is 17048682.

It is not a de Polignac number, because 28684071 - 2² = 28684067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24346 + ... + 25496.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^28684071 is an apocalyptic number.

28684071 is a deficient number, since it is larger than the sum of its proper divisors (17764569).

28684071 is a wasteful number, since it uses less digits than its factorization.

28684071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28684071 is about 5355.7512078139. The cubic root of 28684071 is about 306.1119352120. Note that the first 3 decimals are identical.

The spelling of 28684071 in words is "twenty-eight million, six hundred eighty-four thousand, seventy-one".