28704347 has 18 divisors (see below), whose sum is σ = 35487972. Its totient is φ = 23145024.

The previous prime is 28704317. The next prime is 28704353. The reversal of 28704347 is 74340782.

It is not a de Polignac number, because 28704347 - 2⁶ = 28704283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28704317) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13148 + ... + 15174.

It is an arithmetic number, because the mean of its divisors is an integer number (1971554).

Almost surely, 2^28704347 is an apocalyptic number.

28704347 is a deficient number, since it is larger than the sum of its proper divisors (6783625).

28704347 is a wasteful number, since it uses less digits than its factorization.

28704347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075 (or 2051 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 28704347 is about 5357.6437918174. The cubic root of 28704347 is about 306.1840456610.

The spelling of 28704347 in words is "twenty-eight million, seven hundred four thousand, three hundred forty-seven".