28704671 has 2 divisors, whose sum is σ = 28704672. Its totient is φ = 28704670.

The previous prime is 28704659. The next prime is 28704677. The reversal of 28704671 is 17640782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28704671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28704677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352335 + 14352336.

It is an arithmetic number, because the mean of its divisors is an integer number (14352336).

Almost surely, 2^28704671 is an apocalyptic number.

28704671 is a deficient number, since it is larger than the sum of its proper divisors (1).

28704671 is an equidigital number, since it uses as much as digits as its factorization.

28704671 is an evil number, because the sum of its binary digits is even.

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

The square root of 28704671 is about 5357.6740289047. The cubic root of 28704671 is about 306.1851976730.

The spelling of 28704671 in words is "twenty-eight million, seven hundred four thousand, six hundred seventy-one".