28670913 has 12 divisors (see below), whose sum is σ = 41517840. Its totient is φ = 19065816.

The previous prime is 28670911. The next prime is 28670921. The reversal of 28670913 is 31907682.

It is not a de Polignac number, because 28670913 - 2¹ = 28670911 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28670911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (3459820).

Almost surely, 2^28670913 is an apocalyptic number.

It is an amenable number.

28670913 is a deficient number, since it is larger than the sum of its proper divisors (12846927).

28670913 is a wasteful number, since it uses less digits than its factorization.

28670913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8028 (or 8025 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28670913 is about 5354.5226678015. The cubic root of 28670913 is about 306.0651213446.

The spelling of 28670913 in words is "twenty-eight million, six hundred seventy thousand, nine hundred thirteen".