28890945679 has 4 divisors (see below), whose sum is σ = 30147073776. Its totient is φ = 27634817584.

The previous prime is 28890945673. The next prime is 28890945709. The reversal of 28890945679 is 97654909882.

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

It is not a de Polignac number, because 28890945679 - 2¹⁷ = 28890814607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28890945673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628064014 + ... + 628064059.

It is an arithmetic number, because the mean of its divisors is an integer number (7536768444).

Almost surely, 2^28890945679 is an apocalyptic number.

28890945679 is a deficient number, since it is larger than the sum of its proper divisors (1256128097).

28890945679 is a wasteful number, since it uses less digits than its factorization.

28890945679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256128096.

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 28890945679 in words is "twenty-eight billion, eight hundred ninety million, nine hundred forty-five thousand, six hundred seventy-nine".