28078317 has 24 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 17862720.

The previous prime is 28078313. The next prime is 28078327. The reversal of 28078317 is 71387082.

It is not a de Polignac number, because 28078317 - 2² = 28078313 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16534 + ... + 18152.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^28078317 is an apocalyptic number.

It is an amenable number.

28078317 is a deficient number, since it is larger than the sum of its proper divisors (14378643).

28078317 is a wasteful number, since it uses less digits than its factorization.

28078317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1710 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28078317 is about 5298.8977155631. The cubic root of 28078317 is about 303.9417485629.

The spelling of 28078317 in words is "twenty-eight million, seventy-eight thousand, three hundred seventeen".