28678389671 has 4 divisors (see below), whose sum is σ = 28679667432. Its totient is φ = 28677111912.

The previous prime is 28678389653. The next prime is 28678389673. The reversal of 28678389671 is 17698387682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28678389671 - 2²⁶ = 28611280807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28678389598 and 28678389607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678389673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604601 + ... + 650306.

It is an arithmetic number, because the mean of its divisors is an integer number (7169916858).

Almost surely, 2^28678389671 is an apocalyptic number.

28678389671 is a deficient number, since it is larger than the sum of its proper divisors (1277761).

28678389671 is a wasteful number, since it uses less digits than its factorization.

28678389671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277760.

The product of its digits is 48771072, while the sum is 65.

The spelling of 28678389671 in words is "twenty-eight billion, six hundred seventy-eight million, three hundred eighty-nine thousand, six hundred seventy-one".