28028626989 has 8 divisors (see below), whose sum is σ = 40768912032. Its totient is φ = 16987046640.

The previous prime is 28028626987. The next prime is 28028627047. The reversal of 28028626989 is 98962682082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28028626989 - 2¹ = 28028626987 is a prime.

It is a super-2 number, since 2×28028626989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028626981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424676134 + ... + 424676199.

It is an arithmetic number, because the mean of its divisors is an integer number (5096114004).

Almost surely, 2^28028626989 is an apocalyptic number.

It is an amenable number.

28028626989 is a deficient number, since it is larger than the sum of its proper divisors (12740285043).

28028626989 is a wasteful number, since it uses less digits than its factorization.

28028626989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849352347.

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 28028626989 in words is "twenty-eight billion, twenty-eight million, six hundred twenty-six thousand, nine hundred eighty-nine".