28658447917 has 12 divisors (see below), whose sum is σ = 32170840128. Its totient is φ = 25498807400.

The previous prime is 28658447893. The next prime is 28658447921. The reversal of 28658447917 is 71974485682.

It is not a de Polignac number, because 28658447917 - 2¹¹ = 28658445869 is a prime.

It is a super-2 number, since 2×28658447917² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28658447927) 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, 2513959 + ... + 2525332.

It is an arithmetic number, because the mean of its divisors is an integer number (2680903344).

Almost surely, 2^28658447917 is an apocalyptic number.

It is an amenable number.

28658447917 is a deficient number, since it is larger than the sum of its proper divisors (3512392211).

28658447917 is a wasteful number, since it uses less digits than its factorization.

28658447917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039360 (or 5039349 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 28658447917 in words is "twenty-eight billion, six hundred fifty-eight million, four hundred forty-seven thousand, nine hundred seventeen".